Republican presidential candidate and former Massachusetts Gov. Mitt Romney greets supporters after speaking at a campaign stop at Seven Cities Sod, Monday, Oct. 29, 2012, in Davenport, Iowa. (AP Photo/Charlie Neibergall)

Associated Press
Republican presidential candidate and former Massachusetts Gov. Mitt Romney greets supporters after speaking at a campaign stop at Seven Cities Sod, Monday, Oct. 29, 2012, in Davenport, Iowa. (AP Photo/Charlie Neibergall)
Republican presidential candidate and former Massachusetts Gov. Mitt Romney greets supporters after speaking at a campaign stop at Seven Cities Sod, Monday, Oct. 29, 2012, in Davenport, Iowa. (AP Photo/Charlie Neibergall)
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