Mitt Romney

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney with his wife Ann greet supporters during a campaign rally at the International Exhibition Center in Cleveland, Sunday Nov. 4, 2012. (AP Photo/Jerome Delay)

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Mitt Romney and his wife, Ann, greet supporters in Cleveland on Sunday. “I learned as governor of … Massachusetts that the best achievements are shared achievement,” he said. “I learned that respect and good will go a long way.” (Associated Press)

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Former Massachusetts Gov. Mitt Romney (right), the Republican presidential candidate, steps offstage with his wife, Ann, after a speech at a campaign event at the International Exposition Center in Cleveland on Sunday, Nov. 4, 2012. (AP Photo/David Goldman)

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**FILE** Republican presidential candidate Mitt Romney shakes hands in Swanton, Ohio, with World War II and Korean War veterans returning on an Honor Flight from Washington on Sept. 26, 2012. (Associated Press)

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney campaigns at Colorado Springs Municipal Airport in Colorado Springs, Col., Saturday, Nov. 3, 2012. (AP Photo/Charles Dharapak)

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney speaks as he campaigns at Dubuque Regional Airport, in Dubuque, Iowa, Saturday, Nov. 3, 2012. (AP Photo/Charles Dharapak)

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In this image made with a fisheye lens, Republican presidential candidate and former Massachusetts Gov. Mitt Romney, center, shakes hands with supporters in a hangar as he campaigns at Dubuque Regional Airport, in Dubuque, Iowa, Saturday, Nov. 3, 2012. (AP Photo/Charles Dharapak)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney and Sen. Charles Grassley, R-Iowa, wave before Romney spoke about the economy during a campaign stop at Kinzler Construction Services, Friday, Oct. 26, 2012, in Ames, Iowa. (AP Photo/Charlie Neibergall)

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney greets supporters as he campaigns at Portsmouth International Airport, in Newington, N.H., Saturday, Nov. 3, 2012. (AP Photo/Charles Dharapak)

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney and wife Ann Romney campaign at Portsmouth International Airport, in Newington, N.H., Saturday, Nov. 3, 2012. (AP Photo/Charles Dharapak)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney and his wife Ann Romney, followed by Republican vice presidential candidate Rep. Paul Ryan, R-Wis., and his wife Janna Ryan, wave to supporters at a campaign rally at The Square at Union Centre in West Chester, Ohio, Friday, Nov. 2, 2012. (AP Photo/Charles Dharapak)