Evan Vucci

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Supporters of Republican presidential candidate, former Massachusetts Gov. Mitt Romney listen to him speak during a campaign rally at the U.S. Cellular Center 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 speaks during a campaign rally at the U.S. Cellular Center 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 waves as he arrives for a campaign rally at the U.S. Cellular Center 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, 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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** 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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Republican presidential candidate Mitt Romney speaks during a campaign rally on Monday, Oct. 8, 2012, in Newport News, Va. (AP Photo/Evan Vucci)

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Republican presidential candidate Mitt Romney pauses during a campaign rally on Monday, Oct. 8, 2012, in Newport News, Va. (AP Photo/Evan Vucci)

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Republican presidential candidate Mitt Romney gestures during a foreign policy speech at the Virginia Military Institute on Monday, Oct. 8, 2012, in Lexington, Va. (AP Photo/Evan Vucci)

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Cadets at the Virginia Military Institute listen to Republican presidential candidate Mitt Romney give a foreign policy speech on Monday, Oct. 8, 2012, in Lexington, Va. (AP Photo/Evan Vucci)

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Republican presidential candidate Mitt Romney arrives to make a foreign policy speech at the Virginia Military Institute on Monday, Oct. 8, 2012, in Lexington, Va. (AP Photo/Evan Vucci)

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Cadets at the Virginia Military Institute pray before a foreign policy speech by Republican presidential candidate Mitt Romney on Monday, Oct. 8, 2012, in Lexington, Va. (AP Photo/Evan Vucci)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks during a rally at Valley Forge Military Academy and College on Friday, Sept. 28, 2012 in Wayne, Penn. (AP Photo/ Evan Vucci)