Truck bomb rocks Pakistan's largest city, kills 3

KARACHI, Pakistan (AP) — A suicide bomber smashed a truck packed with explosives into housing for a paramilitary force protecting Pakistan's largest city Thursday, killing three officers in the explosion that sent a large plume of smoke into the sky, officials said.

The blast underlined deteriorating security in Karachi, the sprawling port city of 18 million people that is considered the economic heart of Pakistan. Violence has escalated in recent years in the city as armed groups fight for control of land and resources, and militant groups like the Taliban have used the chaos to consolidate their foothold.

Three security personnel were killed and 20 were wounded in the attack, said a spokesman for the Rangers, speaking on condition of anonymity in line with regulations.

He said the blast would not deter the Rangers from pursuing operations against militants in the city.

The Rangers are a paramilitary force that is tasked with helping Karachi police maintain security in the city.

A truck driven by a suspected suicide bomber smashed into the gates of a residential apartment block where members of the Rangers security forces live, said Javed Odho, deputy inspector general of the Karachi police.

Witnesses reported seeing a large plume of smoke in the sky. Pakistani television images of the blast sight showed what appeared to be an apartment block with a gaping hole in the middle where the bomb went off and part of the two-story building was razed.

Rangers created a perimeter around the building to hold off journalists and bystanders.

One of the Rangers, Muhammed Farooq, said he was preparing for work when he looked out the window and saw a vehicle smash through the main gate and into the building.

"Then there was a really big bang and I lost my balance and I saw a lot of smoke and then I lost consciousness," he said, speaking from the hospital.

There was no immediate claim of responsibility. Taliban militants are known to operate inside the city and have targeted security officials and buildings in the past.

Half a dozen Taliban militants attacked a major naval base in Karachi in May 2011, killing at least 10 people and destroying two U.S.-supplied surveillance aircraft. In September 2011, a Taliban suicide bomber detonated a vehicle packed with explosives outside the home of a senior police officer tasked with cracking down on militants in Karachi. At least eight people died, although the officer survived.

Karachi is in southern Pakistan and is the capital of Sindh province. The sprawling city along the Arabian Sea is the country's wealthiest but has also been beset by escalating violence.

Armed groups backed by political parties are believed to be behind much of the violence in the city such as targeted killings, kidnappings and extortion. The chaos has allowed militants such as the Taliban, who've long had a presence in the city, to strengthen their presence there.

The Pakistani Supreme Court last week held hearings examining the violence, which some worry threatens Karachi's stability.

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Galaxy S3 takes No. 1 position in smartphone market: research

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Rihanna a rock star on Victoria's Secret catwalk

NEW YORK (AP) — Rihanna rocked the lingerie look at Victoria's Secret fashion show in New York, providing the highlight of the live-music soundtrack and holding her own on the catwalk with some of the world's top models.

And those models even had props Wednesday night, including Adriana Lima's ringmaster wand, Doutzen Kroes' body cage and several pairs of the oversized wings that the retailer has made its signature. It would be a close contest who got the biggest wings: Toni Garrn's giant poppy pair or Miranda Kerr's swan-style feathered pouf. Only Lily Aldridge could boast star-spangled wings that shot out silver sparkles.

Alessandra Ambrosio's orchid-petal wings might have lacked a little grandeur, but she made up for it with a $2.5 million jeweled "floral fantasy bra."

Still, wearing a sheer pink mini that gave glimpses of her bra, Rihanna sang "Fresh Out the Runway" at the end of the corset-and-garter parade and she was the one to grab the audience's biggest applause.

The fashion show has become a pre-holiday season tradition for the retailer. CBS will turn it into a one-hour special, which also had performances from Justin Bieber and Bruno Mars, to be shown on Dec. 4.

This year's event had a slight twist. It started with an announcer noting that Victoria's Secret and CBS had each made a donation to relief efforts for Superstorm Sandy, and a thank you to the National Guard members who are based out of the Lexington Avenue Armory that has for years been home to the show.

Mostly, though, models are encouraged to smile, ham it up and show off the extra time at the gym that most admit to in the weeks beforehand. "It's highly televised, and you take that into consideration," said model Joan Smalls ahead of the show. "This is kind of not the same as other runways. You have to prepare your body: No. 1 is the wings are heavy, and No. 2 is you have to be comfortable with your body because the camera will pick up on it if you're not comfortable and confident."

There's an emphasis on glitz, skin and dramatic production here, not wearable undergarment trends for typical Victoria's Secret shoppers. It was divided into six sections: Circus, complete with acrobats, contortionists and a sword eater; Dangerous Liaisons; Pink Is Us; Silver Screen Angels; Angels in Bloom; and Calendar Girls, which allowed Bruno Mars to serenade a model for each month of the year.

For his first song, "Beauty and the Beat," Bieber, wearing low-slung white pants and a white leather studded vest, sat alone with his guitarist in the mellowest part of the show. For "As Long As You Love Me," however, he brought in backup dancers and interacted with the models while moving around a giant makeshift pinball machine.

"It's like a dream come true," said Bieber on the pink carpet before the show. "I would rather be here than anywhere in the world."

___

AP reporter John Carucci contributed to this report.

___

Samantha Critchell tweets fashion at http://www.twitter.com/AP_Fashion

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Experts raise concerns over superhuman workplace

LONDON (AP) — Performance-boosting drugs, powered prostheses and wearable computers are coming to an office near you — but experts warned in a new report Wednesday that too little thought has been given to the implications of a superhuman workplace.

Academics from Britain's leading institutions say attention needs to be focused on the consequences of technology which may one day allow — or compel — humans to work better, longer and harder. Here's their list of upgrades that might make their way to campuses and cubicles in the next decade:

BRAIN BOOSTERS

Barbara Sahakian, a Cambridge neuropsychology professor, cited research suggesting that 16 percent of U.S. students already use "cognitive enhancers" such as Ritalin to help them handle their course loads. Pilots have long used amphetamines to stay alert. And at least one study has suggested that the drug modafinil could help reduce the number of accidents experienced by shift workers.

But bioethicist Jackie Leach Scully of northern England's Newcastle University worries that the use of such drugs might focus on worker productivity over personal well-being.

"Being more alert for longer doesn't mean that you'll be less stressed by the job," she said. "It means that you'll be exposed to that stress for longer and be more awake while doing it."

WEARABLE COMPUTERS

The researchers also noted so-called "life-logging" devices like Nike Inc.'s distance-tracking shoes or wearable computers such as the eyeglasses being developed by Google Inc. The shoes can record your every step; the eyeglasses everything you see. Nigel Shadbolt, an expert in artificial Intelligence at southern England's University of Southampton, said such devices were as little as 15 years away from being able to record every sight, noise and movement over an entire human life.

So do you accept if your boss gives you one?

"What does that mean for employee accountability?" Shadbolt asked.

BIONIC LIMBS — AND BEYOND

The report also noted bionic limbs like the one used this week by amputee Zac Vawter to climb Chicago's Willis Tower or exoskeletons like the one used earlier this year by partially paralyzed London Marathon participant Claire Lomas. It also touched on the development of therapies aimed at sharpening eyesight or cochlear implants meant to enhance hearing.

Scully said any technology that could help disabled people re-enter the workforce should be welcomed but society needs to keep an eye out for unintended consequences.

"One of the things that we know about technology hitting society is that most of the consequences were not predicted ahead of time and a lot of things that we worry about ahead of time turn out not to be problems at all," she said. "We have very little idea of how these technologies will pan out."

THE PRESSURIZED WORKPLACE

The report was drawn up by scientists from The Academy of Medical Sciences, the British Academy, the Royal Academy of Engineering and the Royal Society.

"We're not talking science fiction here," said Genevra Richardson, the King's College law professor who oversaw the report. "These technologies could influence our ability to learn or perform tasks, they could influence our motivation, they could enable us to work in more extreme conditions or in old age, or they could facilitate our return to work after illness or disability .... Their use at work also raises serious ethical, political and economic questions."

Scully said workers may come under pressure to try a new memory-boosting drug or buy the latest wearable computer.

"In the context of a highly pressurized work environment, how free is the choice not to adopt such technologies?" she said.

Union representatives appeared taken aback by some of the experts' predictions. One expressed particular disquiet at the possibility raised by the report that long-distance truck drivers might be asked to take alertness drugs for safety reasons.

"We would be very, very against anything like that," said James Bower, a spokesman for Britain's United Road Transport Union. "We can't have a situation where a driver is told by his boss that he needs to put something in his body."

___

Online:

The report: http://royalsociety.org/policy/projects/human-enhancement

Raphael Satter can be reached on: http://raphae.li/twitter

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Obama faces familiar world of problems in second term

WASHINGTON (AP) — Now that his re-election is secured, President Barack Obama has a freer hand to deal with a world of familiar problems in fresh ways, from toughening America's approach to Iran and Syria while potentially engaging other repressive countries such as Cuba and North Korea and refocusing on moribund Middle East peace efforts.

The first tweaks in his Iran policy could come within weeks, officials said.

But a pressing task for Obama will be to assign a new team to carry out his national security agenda. Secretary of State Hillary Rodham Clinton has announced her plans to retire but could stay a few weeks past January to help the administration as it reshuffles personnel. Defense Secretary Leon Panetta is likely to depart shortly after her. CIA Director Gen. David Petraeus is expected to stay on.

The favorite to succeed Clinton, U.N. Ambassador Susan Rice, would face a difficult Senate confirmation process after her much-maligned explanations of the attack on the U.S. Consulate in Benghazi, Libya, meaning she could land instead as Obama's national security adviser. That job that doesn't require the Senate's approval. Tom Donilon, who currently holds that position, and Chuck Hagel, a former Republican senator, are among the other contenders.

The chances of another early favorite, Senate Foreign Relations Committee Chairman John Kerry, are hampered by Democrats' fear that Republican Scott Brown, who lost his Massachusetts Senate seat Tuesday, could win Kerry's seat in a race to replace him.

Officials, however, are pointing to Jon Huntsman, the former Utah governor, Obama's ambassador to China and Republican presidential candidate, and the State Department's current No. 2, William Burns.

Huntsman is still widely respected by the administration even if he'd hoped to unseat Obama. Choosing Huntsman would allow the president to claim bipartisanship while putting an Asia expert in the job at a time when the U.S. is focusing more attention on the world's most populous continent. Burns would be an option as caretaker secretary until postelection passions in Congress subside and a permanent replacement might face smoother confirmation. He is a career diplomat who has no political baggage and would be unlikely to stir significant opposition among lawmakers.

At the Pentagon, speculation about successors has been limited. Panetta's deputy, Ashton Carter, is seen as a possibility, along with Michele Flournoy, who served as Defense Department policy chief from 2009-12 and would be the first woman in the top job.

New Cabinet members will enter at a time of various global security challenges, from the Arab Spring to China's rapid economic and military expansion in Asia. But the president's escape from any future campaigning also offers unique diplomatic opportunities, which Obama himself hinted at in March when he told then-Russian president and current prime minister Dmitry Medvedev that he'd have "more flexibility" on thorny issues after the election.

Obama's immediate predecessors, Bill Clinton and George W. Bush, used their second terms to launch major, though ultimately unsuccessful initiatives for an Israeli-Palestinian accord, an elusive goal that Obama also deeply desires. This summer he listed the lack of progress toward peace among the biggest disappointments of his presidency so far, suggesting another U.S. attempt in the offing.

Clinton's Camp David negotiations and Bush's Annapolis process became signature foreign policy priorities in 2000 and 2007. But the Israelis and the Palestinians remain as far apart as ever on the contours of an agreement, from the borders of their two separate states to issues related to refugees and resources.

Any Obama-led plan for the Middle East will be complicated by Israel's fears about the Iranian nuclear program, civil war in nearby Syria and the new reality of an Islamist-led Egypt having replaced America's most faithful Arab ally. Obama's difficult relationship with Israeli Prime Minister Benjamin Netanyahu could also complicate the process.

With Iran, the president is holding out hope that crippling economic sanctions will force the Islamic republic's leaders to scale back its uranium enrichment activity. Iran insists its program is designed for energy and medical research purposes, even as many in the West fear the ultimate goal is to produce nuclear weapons. Obama has stressed the narrowing time frame for Tehran to negotiate a peaceful solution to the standoff, while pressing Israel to hold off on any plans for a pre-emptive strike.

Officials say the administration is likely to adjust its two-track approach to Iran — which offers Tehran rewards for coming clean on its nuclear program and harsher penalties for continued defiance — in the coming weeks. Details are still being debated. In the end, however, Obama may have to resort to a military strategy if Iran continues to enrich uranium at higher levels and nears production of weapons-grade material — a possible scenario he acknowledges.

"The clock is ticking. We're not going to allow Iran to perpetually engage in negotiations that lead nowhere," Obama said in his last foreign policy debate with Republican presidential candidate Mitt Romney. "We have a sense of when they would get breakout capacity, which means that we would not be able to intervene in time to stop their nuclear program."

Syria's widening conflict is another concern. More than 36,000 people have died in the last 20 months, as a brutal crackdown on dissent by President Bashar Assad's regime has descended into a full-scale civil war. Obama has demanded Assad's departure, yet has ruled out military assistance to the rebels or American military actions such as airstrikes or enforcing a no-fly zone over Syria.

Last week, in a significant shift in policy, the secretary of state demanded a major shakeup in the opposition's ranks in the hopes of rallying Syrians behind the rebellion. However, Clinton's spokeswoman, Victoria Nuland, reiterated Wednesday the administration still rejects the notion of providing weapons to anti-Assad fighters or any talk of armed intervention.

In other places, Obama's engagement efforts may get another look. After some success with a rapidly liberalizing Myanmar, there are hopes for democratic reforms and human rights advances in Cuba and North Korea, among others.

But short of a rapid change in attitude from these governments, Obama's options for a landmark breakthrough in U.S. diplomacy are limited. He won't be able to reach out to Havana until it frees the jailed U.S. contractor Alan Gross, while Pyongyang will have to denuclearize if it wants better relations with America — steps neither regime has shown a willingness to entertain. The recent re-election of Venezuelan President Hugo Chavez has halted chances for now of any rapprochement between Washington and Caracas.

In Afghanistan, the president will seek to stick to NATO's 2014 withdrawal date for most international troops, a central campaign promise. His administration has been trying unsuccessfully to jump-start peace negotiations between President Hamid Karzai's Western-backed government and the Taliban. The so-called reconciliation effort relies heavily on America's frustrating and unreliable ally Pakistan, where extremist groups such as al-Qaida and the Haqqani network will continue to face U.S. drone attacks.

Behind all the diplomatic efforts are larger questions of American geopolitical strategy. Obama had initial success improving U.S. relations with Russia, getting a nuclear arms-reduction pact in 2011, but has since seen America's former Cold War foe frustrate U.S. missile defense plans and hopes of an international consensus on Syria. The president has continued to trumpet the benefits of his Russia "reset" policy but may take a firmer stance against Moscow if it refuses to show compromise.

For economic reasons, China policy is less likely to change. The world's two biggest economies are deeply interdependent and, despite lingering disagreements over Beijing's currency exchange rates and intellectual property infringement, neither side will want to do anything that threatens a trade war and jeopardizes China's booming growth or America's still-fragile jobs recovery.

___

Associated Press writers Donna Cassata, Robert Burns and Kimberly Dozier contributed to this report.

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China calls Bo Xilai scandal a profound lesson

BEIJING (AP) — China's communists called the scandal surrounding disgraced politician Bo Xilai a "profound lesson" for the ruling party, as delegates gathered in Beijing on Wednesday on the eve of a key leadership congress.

The party's handling of Bo's case underlines the leadership's resolve to uphold integrity and prosecute corruption no matter how high ranking the culprits, congress spokesman Cai Mingzhao told a news conference.

The struggle against corruption remains long term, complex and extremely difficult, Cai said. The 18th national party congress that opens Thursday will thoroughly address the issue and its disciplinary arm will adopt new measures in education, prevention, supervision and punishment, he said.

"Problems involving Bo Xilai ... and others are serious corruption cases among our party's high-ranking leading cadres, and have offered a profound lesson," Cai said.

Bo had been one of China's highest-profile politicians and a candidate for higher office when he fell from grace amid a scandal over his wife's involvement in the murder of a British businessman. Bo dropped from view and in September was expelled from the party and sent for prosecution on charges including corruption and interference in his wife's case.

Cai also cited Liu Zhijun, a former railways minister who was expelled from the party and faces corruption charges.

National party congresses are held once every five years and this year's meeting will usher in a once-in-a-decade transition to a new generation of top officials led by Vice President Xi Jinping.

In addition to selecting members of leading party bodies, the 2,270 delegates hear and deliberate over the work of the party over the last five years, a party discipline report and revisions to the party constitution.

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Move over, Obama; Twitter had a big night too

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Quiet media night explodes suddenly, Rove protests

NEW YORK (AP) — Careful media coverage of a close presidential election Tuesday exploded so suddenly Tuesday that it left the bizarre spectacle of Fox News Channel analyst Karl Rove, a major fundraiser for Republican Mitt Romney, publicly questioning his network's declaration that President Barack Obama had been re-elected.

ABC News was also frantically trying to repair a power outage that left much of its set inoperable precisely at the time the election was being decided.

For several hours, election coverage resembled the run-up to a Super Bowl, with plenty of talk signifying little. Then NBC News, at 11:12 p.m. ET, was the first to declare Obama had won by virtue of winning the battleground state of Ohio. "He remains president of the United States for a second term," said anchor Brian Williams.

Other networks followed suit, including Fox five minutes later. But Rove, the former top political aide to President George W. Bush whose on-air presence on Fox this campaign raised some eyebrows because of his prominent role supporting Romney, suggested the call was premature.

"We've got to be careful about calling things when we have like 991 votes separating the candidates and a quarter of the vote left to count ... I'd be very cautious about intruding in this process," said Rove, a behind-the-scenes player in the wild 2000 election between Bush and Al Gore that took weeks to decide. (Gore was on TV Tuesday, too, as anchor of Current TV's election coverage).

It left Rove's colleagues struggling for words.

"That's awkward," said co-anchor Megyn Kelly. She then went backstage to interview on camera two men who were part of Fox's team in charge of making election calls. They had concluded that based on the precincts where votes were left to be counted, Romney couldn't beat Obama.

Later, Rove tried to make light of the encounter. "This is not a cage match," he said. "This is a light intellectual discussion."

As the evening had progressed for Fox and it became clear that Romney, the clear favorite of most of its audience, would find it hard to win, commentators like Sarah Palin and Peggy Noonan looked stricken.

"This was the referendum that Mitt Romney wanted on Barack Obama," said Huffington Post's Howard Fineman on MSNBC. "And guess what? Barack Obama won the referendum. And that's pretty darned emphatic."

Much of ABC's New York election studio was left powerless for about 20 minutes at the height of Tuesday's coverage. The network didn't inform viewers, and tried to compensate by taking anchors Diane Sawyer and George Stephanopoulos away from their desks, and cutting away to crowd shots at Times Square.

Sawyer's relaxed, folksy delivery in her first presidential election night as anchor drew considerable social media attention. The rock group They Might Be Giants tweeted: "and Diane Sawyer declares tonight's winner is ... chardonnay!"

Sawyer and Stephanopoulos were a new election anchor team for ABC, and Scott Pelley led the CBS coverage. Of the three anchors for the biggest broadcast networks, only NBC's Williams was a returnee from 2008.

But it was a far different media world anyway. 2012 was notable for the vast array of outlets that an interested consumer could command to create their own media experience on multiple screens. Web sites offered deep drill-downs in data and social media hosted raucous conversations.

"If you started a drinking game with the words 'exit poll' in it, please stop now. You will die!" tweeted TV critic Tim Goodman.

Obama's Twitter account tweeted a picture of the president hugging First Lady Michelle Obama, and within 45 minutes it was retweeted more than 300,000 times.

Earlier in the evening, journalists took special care not to rely too heavily on exit polls. Perhaps they remembered how misleading exit polls in 2004 led TV networks astray then or perhaps, in CBS' Bob Schieffer's words, its results this year were too contradictory.

News outlets carefully parsed information and sometimes used the same facts for contradictory conclusions.

Fox News analyst Brit Hume noted an exit poll finding that 42 percent of voters said Superstorm Sandy was an important factor in their vote, suggesting that was a positive for Obama since he was widely considered to have been effective in his response. With the same information, the web site Politico headlined: "Exit Survey: Sandy Not a Factor."

There was a certain amount of vamping time, too. Glenn Beck's online network, The Blaze, had a blackboard straight out of the 1960s as a tote board. Beck killed time on the air by asking for cookie dough ice cream from the on-set food bar.

"Waffle cone, please," Beck said.

When Sawyer asked David Muir for the latest news from the Romney campaign, he reported the family had pasta for dinner and the candidate indulged in his favorite peanut butter and honey sandwich.

The media personality with perhaps the most on the line was Nate Silver of The New York Times, whose FiveThirtyEight blog was sought out by 20 percent of the people who visited the newspaper's website on Monday. He has used statistical data throughout the campaign to predict an Obama victory and by Tuesday, had forecast a 90.9 percent chance that Obama would win.

After Obama's victory became clear, Gavin Purcell, producer of "Late Night with Jimmy Fallon," tweeted that "Nate Silver is the only white male winning tonight." CNN's Piers Morgan tweeted Silver an invitation to appear on his show Wednesday.

___

Television Writers Frazier Moore in New York and Lynn Elber in Los Angeles contributed to this report.

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Study: Stem cells from strangers can repair hearts

LOS ANGELES (AP) — Researchers are reporting a key advance in using stem cells to repair hearts damaged by heart attacks. In a study, stem cells donated by strangers proved as safe and effective as patients' own cells for helping restore heart tissue.

The work involved just 30 patients in Miami and Baltimore, but it proves the concept that anyone's cells can be used to treat such cases. Doctors are excited because this suggests that stem cells could be banked for off-the-shelf use after heart attacks, just as blood is kept on hand now.

Results were discussed Monday at an American Heart Association conference in California and published in the Journal of the American Medical Association.

The study used a specific type of stem cells from bone marrow that researchers believed would not be rejected by recipients. Unlike other cells, these lack a key feature on their surface that makes the immune system see them as foreign tissue and attack them, explained the study's leader, Dr. Joshua Hare of the University of Miami.

The patients in the study had suffered heart attacks years earlier, some as long as 30 years ago. All had developed heart failure because the scar tissue from the heart attack had weakened their hearts so much that they grew large and flabby, unable to pump blood effectively.

Researchers advertised for people to supply marrow, which is removed using a needle into a hip bone. The cells were taken from the marrow and amplified for about a month in a lab at Baltimore's Johns Hopkins University, then returned to Miami to be used for treatment, which did not involve surgery.

The cells were delivered through a tube pushed through a groin artery into the heart near the scarred area. Fifteen patients were given cells from their own marrow and 15 others, cells from strangers.

About a year later, scar tissue had been reduced by about one-third. Both groups had improvements in how far they could walk and in quality of life. There was no significant difference in one measure of how well their hearts were able to pump blood, but doctors hope these patients will continue to improve over time, or that refinements in treatment will lead to better results.

The big attraction is being able to use cells supplied by others, with no blood or tissue matching needed.

"You could have the cells ready to go in the blood bank so when the patient comes in for a therapy — there's no delay," Hare said. "It's also cheaper to make the donor cells," and a single marrow donor can supply enough cells to treat as many as 10 people.

Dr. Elliott Antman of Harvard-affiliated Brigham and Women's Hospital in Boston who heads the heart conference, praised the work.

"That opens up an entire new avenue for stem cell therapy, like a sophisticated version of a blood bank," he said. There's an advantage in not having to create a cell therapy for each patient, and it could spare them the pain and wait of having their own marrow harvested, he said.

The study was sponsored by the National Institutes of Health. Hare owns stock in a biotech company working on a treatment using a mixture of cells.

Juan Lopez received his own cells in the study, and said it improved his symptoms so much that at age 70, he was able to return to his job as an engineer and sales manager for a roofing manufacturer and ride an exercise bike.

"It has been a life-changing experience," said Lopez, who lives in Miami. "I can feel day by day, week by week, month by month, my improvement. I don't have any shortness of breath and my energy level is way up there. I don't have any fluid in my lungs."

And, he said happily, "My sex drive has improved!"

___

Marilynn Marchione can be followed at http://twitter.com/MMarchioneAP .

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'We remain more than a collection of red states and blue states'

President Barack Obama handily defeated Gov. Mitt Romney and won himself a second term on Tuesday after a bitter and historically expensive race that was primarily fought in just a handful of battleground states. Obama beat Romney after nabbing almost every one of the 12 crucial battleground states.

The Romney campaign's last-ditch attempt to put blue-leaning Midwestern swing states in play failed as Obama's Midwestern firewall sent the president back to the White House for four more years. Obama picked up the swing states of New Hampshire, Michigan, New Mexico, Iowa, Virginia, Wisconsin, Colorado, Nevada, Pennsylvania, Minnesota and Ohio. Of the swing states, Romney picked up only North Carolina. Florida is still too close to call, but even if Romney wins the state, Obama still beat him in the Electoral College vote. The popular vote will most likely be narrower than the president's decisive Electoral College victory.

In a sweeping victory speech early Wednesday morning, Obama thanked every American who voted, and vowed to work with leaders from both parties to tackle the country's challenges.

"Our economy is recovering, a decade of war is ending, a long campaign is now over," he told a crowd of cheering supporters in Chicago. "And whether I earned your vote or not, I have listened to you, I have learned from you and you have made me a better president." Obama added he has "never been more hopeful about America. ... We're not as divided as our politics suggest. We remain more than a collection of blue states and red states."

In his speech, he offered clues to the policy goals of his second term, which included a deficit reduction plan that combines tax increases with spending cuts, a comprehensive overhaul of the nation's federal immigration laws and tax reform. He called on Republicans to join him in achieving those goals.

The battle for the White House between Obama and Romney divided the nation, causing, at times, bitter disputes between the parties. Obama urged his supporters to look beyond the fight of the past several months and defended the process of choosing a president.

"I know that political campaigns can sometimes seem small, even  silly," Obama said. "And that provides plenty of fodder for the cynics who tell us  that politics is nothing more than a contest of evils or the domain of  special interests. If you ever get the chance to talk to folks who  turned out to our rallies and along the rope lines of high school gyms,  or saw folks working late at campaign office or some tiny county a long way from home, you'll discover something else."

Romney conceded in Boston in a speech around 1 a.m. ET. "Like so many of you, Paul [Ryan] and I have left everything on the field. We have given our all to this campaign," Romney said. "I so wish that I had been able to fulfill your hopes to lead your country in another direction. But the nation chose another leader." Romney congratulated the president and his campaign on their victory.

The Obama victory marks an end to a years-long campaign that saw historic advertisement spending levels, countless rallies and speeches, and three much-watched debates.

The Romney campaign cast the election as a referendum on Obama's economic policies, frequently comparing him to former President Jimmy Carter and asking voters the Reagan-esque question of whether they are better off than they were four years ago. But the Obama campaign pushed back, blanketing key states such as Ohio early on with ads painting him as a multimillionaire more concerned with profits than people. The Obama campaign also aggressively attacked Romney on reproductive rights issues, tying Romney to a handful of Republican candidates who made controversial comments about rape and abortion.

The ads were one reason Romney faced a steep likeability problem for most of the race, until his expert performance at the first presidential debate in Denver in October. After that debate, and a near universal panning of Obama's performance, Romney caught up with Obama in national polls, and almost closed his favorability gap with the president. In polls, voters consistently gave him an edge over Obama on who would handle the economy better and create more jobs, even as they rated Obama higher on caring about the middle class.

But the president's Midwestern firewall—and the campaign's impressive grassroots operation—carried him through. Ohio tends to vote a bit more Republican than the nation as a whole, but Obama was able to stave off that trend and hold an edge there over Romney, perhaps due to the president's support of the auto bailout three years ago. Romney and his running mate, Paul Ryan, all but moved to Ohio in the last weeks of the campaign, trying and ultimately failing to erase Obama's lead there.

A shrinking electoral battleground this year meant that only 12 states were really seen as in play, and both candidates spent most of their time and money there. Though national polls showed the two candidates in a dead heat, Obama consistently held a lead in the states that mattered. That, and his campaign's much-touted get-out-the-vote efforts and overall ground game, may be what pushed Obama over the finish line.

Now, Obama heads back to office facing what will most likely be bitterly partisan negotiations over whether the Bush tax cuts should expire. The House will still be majority Republican, with Democrats maintaining their majority in the Senate.

The loss may provoke some soul searching in the Republican Party. This election was seen as a prime opportunity to unseat Obama, as polls showed Americans were unhappy with a sluggish economy, sky-high unemployment and a health care reform bill that remained widely unpopular. Romney took hardline positions on immigration, federal spending and taxes during the long Republican primary when he faced multiple challenges from the right. He later shifted to the center in tone on many of those issues, but it's possible the primary painted him into a too-conservative corner to appeal to moderates during the general election. The candidate also at times seemed unable to effectively counter Democratic attacks on his business experience and personal wealth.

"In the coming weeks and months I am looking forward to reaching out to leaders of both parties," Obama said.

He won't have much time to fulfill that promise. With tax hikes looming and a sequestration deal that will make enormous , automatic cuts in government funding, Congress and the White House must move quickly to find a compromise and put Obama's high-minded rhetoric into action.

Chris Moody contributed reporting from Chicago.

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