Mitt Romney

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Republican presidential candidate Mitt Romney speaks Aug. 14, 2012, during a campaign event at the American Energy Corporation in Beallsville, Ohio. (Associated Press)

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Republican presidential candidate Mitt Romney addresses supporters on Monday, Aug. 13, 2012, during a campaign stop in Miami. (Associated Press)

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“I’m told Gov. Romney’s new running mate might be around Iowa these next few days, and he’s one of those leaders of Congress standing in the way” of a farm bill. (Associated Press)

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Republican presidential candidate Mitt Romney speaks Aug. 13, 2012, during a campaign event at Flagler College in St. Augustine, Fla. (Associated Press)

Republican presidential candidate Mitt Romney (right) listens as his vice presidential running mate, Rep. Paul Ryan, speaks during a campaign stop at the NASCAR Technical Institute on Sunday, Aug. 12, 2012, in Mooresville, N.C. (AP Photo/Mary Altaffer)

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Rep. Paul Ryan of Wisconsin, who was named as announced Republican presidential candidate Mitt Romney's running mate, addresses a crowd Aug. 11, 2012, during a campaign event with Romney in Norfolk, Va. (Associated Press)

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Rep. Paul Ryan, R-Wis., newly announced Republican vice presidential candidate to Republican presidential candidate, former Massachusetts Gov. Mitt Romney, high-fives people in the crowd after speaking at a campaign event Saturday, Aug. 11, 2012, in Norfolk, Va. (AP Photo/Mary Altaffer)