Politics

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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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Republican presidential candidate, former Massachusetts Gov. Mitt Romney waves to members of the audience before the start of the last debate. (AP Photo/Pablo Martinez Monsivais)

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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)

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)

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Ann Romney, center, wife of Republican presidential nominee Mitt Romney, watches activity before the start of the third presidential debate at Lynn University. (AP Photo/Pool-Michael Reynolds)

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Moderator Bob Schieffer, right, watches as President Barack Obama, center, shakes hands with Republican presidential nominee Mitt Romney during the third presidential debate at Lynn University. (AP Photo/Eric Gay)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney, second from left, and his wife Ann, left, sits in a holding room with his family before he participates in the third presidential debate with President Barack Obama. (AP Photo/ Evan Vucci)

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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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The sun sets ahead of the presidential debate between Republican presidential candidate, former Massachusetts Gov. Mitt Romney and President Barack Obama, at Lynn University, Monday, Oct. 22, 2012, in Boca Raton, Fla. (AP Photo/David Goldman)

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Workers pose for a photo with a life-sized cutout of President Barack Obama at a presidential debate fair on the campus of Lynn University, Monday, Oct. 22, 2012, in Boca Raton, Fla., where President Barack Obama and Republican presidential candidate and former Massachusetts Gov. Mitt Romney will hold their final debate. (AP Photo/Eric Gay)

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Doris Smith, of Boynton Beach, Fla., wears buttons on her shirt before the presidential debate. (AP Photo/Charlie Neibergall)

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Cutouts of President Barack Obama and Republican presidential candidate, former Massachusetts Gov. Mitt Romney, sit behind an AARP display before the candidates' final debate. (AP Photo/Charlie Neibergall)

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Lynn University student Matt Alleva uses patriotic tubes to float on the water during a pre-debate pool party on campus, Monday, Oct. 22, 2012, in Boca Raton, Florida. President Barack Obama and Republican presidential candidate and former Massachusetts Gov. Mitt Romney will hold their final debate at Lynn University Monday. (AP Photo/Eric Gay)

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

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In this photo combo, Republican presidential nominee Mitt Romney, left and President Barack Obama face each other during the third presidential debate with President Barack Obama at Lynn University, Monday, Oct. 22, 2012, in Boca Raton, Fla. (AP Photo/Eric Gay, David Goldman)

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Moderator Bob Schieffer, center, watches as Republican presidential candidate, former Massachusetts Gov. Mitt Romney and President Barack Obama shake hands before the start of the last debate at Lynn University, Monday, Oct. 22, 2012, in Boca Raton, Fla. (AP Photo/Pablo Martinez Monsivais)

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Mitt Romney’s chances of beating President Obama may come down to a narrow slice of the electorate in just 106 cities and counties in nine states. (Associated Press)