Mitt Romney

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Republican presidential candidate Mitt Romney is applauded Oct. 4, 2012, by sons Josh (center) and Tagg (left) as he speaks at a Colorado Conservative Political Action Committee meeting in Denver. (Associated Press)

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Republican presidential nominee Mitt Romney and President Obama shake hands on Wednesday, Oct. 3, 2012, after the first presidential debate at the University of Denver. (Associated Press)

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Jordan Johnston, 20, and Jessica Johnston, 27, supporters of Republican presidential candidate Mitt Romney prepare to watch the debate on a outside screen at the University of Denver Wednesday, Oct. 3, 2012, in Denver. (AP Photo/Chris Schneider)

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Republican presidential nominee Mitt Romney and President Barack Obama shake hands after the first presidential debate at the University of Denver, Wednesday, Oct. 3, 2012, in Denver. (AP Photo/Charlie Neibergall)

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Republican presidential nominee Mitt Romney and President Obama wave to the audience during the first presidential debate at the University of Denver on Wednesday, Oct. 3, 2012, in Denver. (AP Photo/Charlie Neibergall)

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President Obama and Republican presidential nominee Mitt Romney participate Oct. 3, 2012, in the first presidential debate at the University of Denver in Denver. (Associated Press)

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** FILE ** Republican presidential nominee Mitt Romney and President Obama speak during the first presidential debate, at the University of Denver on Wednesday, Oct. 3, 2012, in Denver. (AP Photo/David Goldman/Eric Gay)

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President Barack Obama and Republican presidential candidate and former Massachusetts Gov. Mitt Romney meet on stage at the start of the first presidential debate in Denver, Wednesday, Oct. 3, 2012. (AP Photo/Charles Dharapak)

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Last-minute stage setup for the first presidential debate between President Barack Obama and Republican presidential nominee Mitt Romney at the University of Denver takes place as seen in a television camera monitor Wednesday, Oct. 3, 2012, in Denver. (AP Photo/J. David Ake)