Mitt Romney

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Republican presidential candidate Mitt Romney makes a point during a campaign stop at Jet Machine, a defense contractor, in Cincinnati on Thursday, Oct. 25, 2012. (AP Photo/Al Behrman)

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Republican presidential candidate Mitt Romney greets supporters following a campaign rally in Reno, Nev., on Wednesday, Oct. 24, 2012. (AP Photo/Cathleen Allison)

Republican presidential candidate, former Massachusetts Gov. Mitt Romney sits and talks to a customer as he makes an unscheduled stop at First Watch cafe in Cincinnati, Ohio, Thursday, Oct. 25, 2012. (AP Photo/Charles Dharapak)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks as he campaigns in Reno, Nev., on Wednesday, Oct. 24, 2012. (AP Photo/Cathleen Allison)

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** FILE ** Republican presidential candidate former Massachusetts Gov. Mitt Romney campaigns at Landmark Aviation at The Eastern Iowa Airport in Cedar Rapids, Iowa, Wednesday, Oct. 24, 2012. (AP Photo/Charles Dharapak)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks as he campaigns in Reno, Nev., on Wednesday, Oct. 24, 2012. (AP Photo/Cathleen Allison)

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Republican presidential candidate Mitt Romney greets supporters Oct. 24, 2012, at an election campaign rally at the Reno Event Center in Reno, Nev. (Associated Press)

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Republican presidential candidate Mitt Romney speaks Oct. 23, 2012, during a campaign event at the Red Rocks Amphitheatre in Golden, Colo. (Associated Press)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney, right, and his vice presidential running mate, Rep. Paul Ryan, R-Wis., talk aboard their campaign plane en route from Las Vegas to a campaign event in Denver, Tuesday, Oct. 23, 2012. (AP Photo/David Goldman)