Barack Obama

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Singer Katy Perry performs Oct. 24, 2012, for a crowd before the arrival of President Obama at a campaign rally in Las Vegas. (Associated Press)

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Singer Katy Perry performs Oct. 24, 2012, for a crowd before the arrival of President Obama at a campaign rally in Las Vegas. (Associated Press)

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President Barack Obama speaks at a joint campaign rally with Vice President Joe Biden, left, Tuesday, Oct. 23, 2012, at Triangle Park in Dayton. (AP Photo/Al Behrman)

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President Barack Obama walks across the South Lawn to the White House from Marine One, Tuesday, Oct. 23, 2012, in Washington. (AP Photo/Carolyn Kaster)

Supporters hold banners and a doll as President Barack Obama shakes hands with supporters during a campaign event at Triangle Park in Dayton, Ohio, Tuesday, Oct. 23, 2012, the day after the last presidential debate against Republican Presidential candidate, former Massachusetts Gov. Mitt Romney. (AP Photo/Pablo Martinez Monsivais)

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President Barack Obama stops to waves to supporters as he takes the stage during a campaign event at Triangle Park in Dayton, Ohio, Tuesday, Oct. 23, 2012, the day after the last presidential debate against Republican Presidential candidate, former Massachusetts Gov. Mitt Romney. (AP Photo/Pablo Martinez Monsivais)

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Bruce Springsteen ralliesw support for President Barack Obama during a free concert held Tuesday afternoon Oct. 23, 2012 at the nTelos Wireless Pavilion in Charlottesville, Va. (AP Photo/The Daily Progress/Andrew Shurtleff)

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Vice President Joe Biden stops to be photographed with a supporter during a campaign event with President Barack Obama at Triangle Park in Dayton, Ohio, Tuesday, Oct. 23, 2012, the day after the last presidential debate against Republican Presidential candidate, former Massachusetts Gov. Mitt Romney. (AP Photo/Pablo Martinez Monsivais)

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President Barack Obama is embraced by a unidentified supporter during a campaign event at Triangle Park in Dayton, Ohio, Tuesday, Oct. 23, 2012, the day after the last presidential debate against Republican Presidential candidate, former Massachusetts Gov. Mitt Romney. (AP Photo/Pablo Martinez Monsivais)

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Linda Lee (right), the owner of the Lions Den Coffee Bar in Fisherville, Pa., has arranged straw men of President Obama and Gov. Mitt Romney, the Republican presidential nominee, having coffee together on the porch outside the front entrance on Monday as Nancy Jacobson looks on. (Andrew Harnik/The Washington Times)

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Republican presidential nominee Mitt Romney answers a question and President Barack Obama listens during the third presidential debate at Lynn University, Monday, Oct. 22, 2012, in Boca Raton, Fla. (AP Photo/Charlie Neibergall)

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Ann Romney, wife of Republican presidential candidate, former Massachusetts Gov. Mitt Romney, laughs as she pulls her husband away from the edge of the stage after the third presidential debate with President Barack Obama at Lynn University, Monday, Oct. 22, 2012, in Boca Raton, Fla. (AP Photo/Pablo Martinez Monsivais)

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President Barack Obama and Republican presidential nominee Mitt Romney meet family members after the third presidential debate at Lynn University, Monday, Oct. 22, 2012, in Boca Raton, Fla. (AP Photo/Pool-Michael Reynolds)