Mitt Romney

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Republican presidential candidate Mitt Romney speaks Oct. 23, 2012, with staff members aboard his plane en route to a campaign stop in Nevada after departing from West Palm Beach, Fla. (Associated Press)

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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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**FILE** President Obama (left) and Republican presidential candidate Mitt Romney walk past each other onstage Oct. 22, 2012, at the end of the final presidential debate at Lynn University in Boca Raton, Fla. (Associated Press)

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Republican presidential nominee Mitt Romney gives a thumbs up towards the crowd after the third presidential debate at Lynn University, Monday, Oct. 22, 2012, in Boca Raton, Fla. (AP Photo/Pool, Win McNamee)

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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)

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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 his wife Ann react towards the audience after 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 candidate Mitt Romney (right) and President Obama walk past each other onstage at the end of the final presidential debate, at Lynn University in Boca Raton, Fla., on Monday, Oct. 22, 2012. (AP Photo/Pablo Martinez Monsivais)

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President Obama carries a baby as he prepares to leave a campaign stop in Delray Beach, Fla., on Tuesday, Oct. 23, 2012, a day after the last presidential debate with Republican candidate Mitt Romney. (AP Photo/Alan Diaz)

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President Obama holds up a copy of his jobs and economic reform plan during a campaign event at the Delray Beach Tennis Center in Delray Beach, Fla., on Oct. 23, 2012, the day after the final presidential debate against Republican candidate Mitt Romney. (Associated Press)

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Republican presidential candidate Mitt Romney exits his vehicle before boarding his campaign plane in West Palm Beach, Fla., on Tuesday, Oct. 23, 2012, en route to Nevada for a campaign stop, after the previous evening's final presidential debate with President Obama. (AP Photo/David Goldman)

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Republican presidential candidate Mitt Romney boards his campaign plane in West Palm Beach, Fla., on Tuesday, Oct. 23, 2012, en route to a campaign stop in Nevada, after the final presidential debate Monday night with President Obama. (AP Photo/David Goldman)

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** FILE ** President Obama waves as he takes the stage at a campaign event at Delray Beach Tennis Center on Tuesday, Oct. 23, 2012, in Delray Beach, Fla., a day after the final presidential debate against Republican rival Mitt Romney. (AP Photo/Pablo Martinez Monsivais)

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Police officers applaud as they are greeted by Republican presidential candidate Mitt Romney (with his back to the camera) before he boarded his campaign plane in West Palm Beach, Fla., on Tuesday, Oct. 23, 2012, en route to Nevada for a campaign stop, after last night's final presidential debate against President Obama. (AP Photo/David Goldman)