Evan Vucci

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney boards his campaign plane for an event in Iowa on Friday, Sept. 7, 2012, in Portsmouth, N.H. (AP Photo/Evan Vucci)

Republican presidential candidate Mitt Romney and his wife, Ann, leave the Church of Jesus Christ of Latter-day Saints after services on Sunday, Sept. 2, 2012, in Wolfeboro, N.H. (AP Photo/Evan Vucci)

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Secret Service agents stand guard as Republican presidential nominee, former Massachusetts Gov. Mitt Romney walks to his car after services at the Church of Jesus Christ of Latter-day Saints on Sunday, Sept. 2, 2012 in Wolfeboro, N.H. (AP Photo/Evan Vucci)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney, his wife Ann, center, and Gov. Bobby Jindal, R-La., right, talk with Sen. David Vitter, R-La., back to camera, during a tour of flooding caused by hurricane Isaac, Friday, Aug. 31, 2012, in Jean Lafitte, La. (AP Photo/Evan Vucci)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney and his wife Ann, leave Brewster Academy after working on convention preparations, Monday, Aug. 27, 2012, in Wolfeboro, N.H. (AP Photo/Evan Vucci)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney leaves Brewster Academy after working on convention preparations, Monday, Aug. 27, 2012, in Wolfeboro, N.H. (AP Photo/Evan Vucci)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney and his wife Ann arrive at Brewster Academy for convention preparations on Sunday, Aug. 26, 2012 in Wolfeboro, N.H. (AP Photo/Evan Vucci)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney, center, and his wife Ann, arrive at the Oakland County International Airport with vice presidential running mate Rep. Paul Ryan, R-Wis., on Friday, Aug. 24, 2012 in Waterford, Mich. (AP Photo/Evan Vucci)