Mitt Romney

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Republican presidential candidate Mitt Romney waves following a campaign rally on Oct. 7, 2012 in Port St. Lucie, Fla. (Associated Press)

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Republican presidential candidate Mitt Romney exits his vehicle Oct. 16, 2012, before boarding his campaign plane in Bedford, Mass. (Associated Press)

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**FILE** Republican presidential candidate Mitt Romney campaigns Oct. 12, 2012, at the Mobility Supercenter in Richmond, Va. (Associated Press)

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**FILE** Republican presidential candidate Mitt Romney (left on stage) is introduced by his running mate Paul Ryan as Sen. Rob Portman, Ohio Republican, watches during a Oct. 12, 2012, campaign event in Lancaster, Ohio. (Associated Press)

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**FILE** Republican presidential candidate Mitt Romney greets supporters Oct. 12, 2012, during a campaign rally in Lancaster, Ohio. (Associated Press)

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**FILE** Republican presidential candidate Mitt Romney campaigns Oct. 13, 2012, at Shawnee State University in Portsmouth, Ohio. (Associated Press)

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**FILE** Republican presidential candidate Mitt Romney greets customers Oct. 12, 2012, as he makes an unscheduled stop at City Barbeque in Gahanna, Ohio. (Associated Press)

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**FILE** Republican presidential candidate Mitt Romney campaigns Oct. 13, 2012, at Shawnee State University in Portsmouth, Ohio. (Associated Press)

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In this combination of file photos, Republican presidential candidate Mitt Romney (left) takes a bite of pizza while campaigning at Village Pizza in Newport, N.H., Dec. 20, 2011, and then-Sen. Barack Obama takes a bite of pizza at American Dream Pizza in Corvallis, Ore., on March 21, 2008. (Associated Press)