Mitt Romney

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks during a campaign rally at the U.S. Cellular Center on Thursday, Oct. 11, 2012, in Asheville, N.C. (AP Photo/Matt Rose)

Republican presidential candidate, former Massachusetts Gov. Mitt Romney, center, watches the vice presidential debate in his hotel room on Thursday, Oct. 11, 2012, in Asheville, N.C. (AP Photo/ Evan Vucci)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney, right, watches the vice presidential debate in his hotel room on Thursday, Oct. 11, 2012 in Asheville, N.C. (AP Photo/ Evan Vucci)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney walks with Sen. Rob Portman, R-Ohio, as he arrives in Richmond, Va., Friday, Oct. 12, 2012. (AP Photo/Charles Dharapak)

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney boards his campaign plane in Fletcher, N.C., Friday, Oct. 12, 2012. (AP Photo/Charles Dharapak)

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Former Massachusetts Gov. Mitt Romney, the Republican presidential nominee, greets excited supporters as he arrives for a campaign rally at the U.S. Cellular Center in Asheville, N.C., on Thursday. (The Associated Press)

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** FILE ** Republican presidential candidate, former Massachusetts Gov. Mitt Romney, right, watches the vice presidential debate with Sen. Rob Portman, R- Ohio, left, in his hotel room in Asheville, N.C. (AP Photo/ Evan Vucci)

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In this Oct. 8, 2012, photo, Republican presidential candidate, former Massachusetts Gov. Mitt Romney gives a foreign policy speech at Virginia Military Institute in Lexington, Va. (Associated Press)

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** FILE ** Republican presidential candidate Mitt Romney makes a point on Wednesday, Oct. 10, 2012, at a campaign rally in Mount Vernon, Ohio, as New Jersey Gov. Chris Christie looks on. (Associated Press)

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Republican presidential candidate Mitt Romney makes a point Wednesday at a campaign rally in Mount Vernon, Ohio, as New Jersey Gov. Chris Christie looks on. (Associated Press)

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Republican presidential candidate Mitt Romney makes a point Wednesday at a campaign rally in Mount Vernon, Ohio, as New Jersey Gov. Chris Christie looks on. (Associated Press)

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Republican presidential candidate Mitt Romney speaks Oct. 10, 2012, during a town hall meeting at Ariel Corporation in Mt. Vernon, Ohio. (Associated Press)