Mitt Romney

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Republican presidential candidate Mitt Romney boards his campaign plane at Weyers Cave-Shenandoah Valley Airport in Weyers Cave, Va., on Oct. 5, 2012. (Associated Press)

Republican presidential candidate Mitt Romney greets supporters Oct. 4, 2012, as he takes the stage during a rally at the Augusta Expoland in Fishersville with running mate Paul Ryan. (Associated Press/Michael Reilly, Daily News-Record)

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Republican presidential candidate Mitt Romney gestures during a rally in Fishersville, Va., on Thursday, Oct. 4, 2012. (AP Photo/Steve Helber)

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Republican presidential candidate Mitt Romney speaks at a Colorado Conservative Political Action Committee (CPAC) meeting in Denver on Thursday, Oct. 4, 2012. (AP Photo/Charles Dharapak)

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GOP presidential hopeful Mitt Romney is applauded by sons Josh (center) and Tagg (left) as he speaks Thursday at a Conservative Political Action Conference in Denver. Attendees hailed his debate performance of the night before. (Associated Press)

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Republican presidential candidate Mitt Romney (left) and President Obama participate in the first presidential debate at the University of Denver in Denver on Wednesday, Oct. 3, 2012. (AP Photo/Charlie Neibergall)

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In this photo taken Oct. 4, 2012, Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks in Denver. (AP Photo/Charles Dharapak)

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Republican presidential nominee Mitt Romney speaks during the first presidential debate with President Barack Obama at the University of Denver, Wednesday, Oct. 3, 2012, in Denver. (AP Photo/The Denver Post, John Leyba)