Barack Obama

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President Barack Obama and Republican presidential nominee Mitt Romney greet moderator Bob Schieffer at the start of the third presidential debate at Lynn University, Monday, Oct. 22, 2012, in Boca Raton, Fla. (AP Photo/Pool-Michael Reynolds)

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Republican presidential nominee Mitt Romney, right, and President Barack Obama shake hands with audience members following the third presidential debate at Lynn University, Monday, Oct. 22, 2012, in Boca Raton, Fla. (AP Photo/Eric Gay)

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Republican presidential nominee Mitt Romney and President Barack Obama react to moderator Bob Schieffer during the third presidential debate at Lynn University, Monday, Oct. 22, 2012, in Boca Raton, Fla. (AP Photo/Charlie Neibergall)

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Moderator Bob Schieffer, center, watches as Republican presidential nominee Mitt Romney, left and President Barack Obama wave to members of the audience during the third presidential debate at Lynn University, Monday, Oct. 22, 2012, in Boca Raton, Fla. (AP Photo/Eric Gay)

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President Barack Obama and moderator Bob Schieffer, right, listen to Republican presidential nominee Mitt Romney, left, during the third presidential debate at Lynn University, Monday, Oct. 22, 2012, in Boca Raton, Fla. (AP Photo/David Goldman)

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President Barack Obama speaks during the third presidential debate with Republican presidential nominee Mitt Romney. (AP Photo/David Goldman)

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Republican presidential nominee Mitt Romney answers a question during the third presidential debate with President Barack Obama at Lynn University. (AP Photo/Eric Gay)

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President Barack Obama listens as Republican presidential nominee Mitt Romney speaks during the third presidential debate at Lynn University. (AP Photo/Pool-Rick Wilking)

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Moderator Bob Schieffer addresses the audience before the third presidential debate between President Barack Obama and Republican presidential nominee Mitt Romney. (AP Photo/Eric Gay)

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President Barack Obama answers a question as Republican presidential nominee Mitt Romney listens during the third presidential debate. (AP Photo/Pool, Win McNamee)

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

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Republican presidential nominee Mitt Romney and President Barack Obama answer a question during the third presidential debate at Lynn University. (AP Photo/Pool-Win McNamee)

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President Barack Obama, right, waves to members of the audience before the start of the last debate. (AP Photo/Pablo Martinez Monsivais)

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Moderator Bob Schieffer, center, watches as Republican presidential candidate, former Massachusetts Gov. Mitt Romney and President Barack Obama take their seats before the start of the last debate. (AP Photo/Pablo Martinez Monsivais)