Mitt Romney

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Sen. John McCain, Arizona Republican, stumps Oct. 2, 2012, for GOP presidential candidate Mitt Romney during a "Veterans for Romney" event at the Fish House in Pensacola, Fla. (Associated Press/The Pensacola News Journal)

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**FILE** Republican presidential candidate Mitt Romney speaks Sept. 26, 2012, in Westerville, Ohio. (Associated Press)

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Stand-ins for debate moderator Jim Lehrer (center), Republican presidential candidate Gov. Mitt Romney (left) and President Obama run through a rehearsal for Wednesday’s debate in Denver. (Associated Press)

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Television crews setup on a riser out side of the Magness Arena at the University of Denver in Denver,Tuesday, Oct. 2, 2012, where the first presidential debate between President Obama and Republican presidential candidate Mitt Romney is scheduled for Oct. 3. (AP Photo/Ed Andrieski)

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FILE - In this Sept. 26, 2012 file photo, Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks in Westerville, Ohio.

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Republican presidential candidate Mitt Romney campaigns at Wings Over the Rockies Air and Space Museum in Denver on Monday, Oct. 1, 2012. (AP Photo/Charles Dharapak)

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney laughs as he talks with senior advisers on his campaign plane en route to Denver, Monday, Oct. 1, 2012. (AP Photo/Charles Dharapak)

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney talks with Sen. Rob Portman, R-Ohio, who has also been his debate practice partner, on his campaign charter plane en route Denver, Monday, Oct. 1, 2012. (AP Photo/Charles Dharapak)