Mitt Romney

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Republican presidential candidate Mitt Romney talks with supporters during a campaign stop on Tuesday, Oct. 9, 2012, in Cuyahoga Falls, Ohio. (AP Photo/Evan Vucci)

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Republican presidential candidate Mitt Romney shakes hands during a campaign rally on Tuesday, Oct. 9, 2012, in Cuyahoga Falls, Ohio. (AP Photo/Evan Vucci)

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Mitt Romney, the Republican presidential nominee, arrives for a rally in Van Meter, Iowa. Mr. Romney told the crowd that “When I become president, I will do everything in my power to strengthen once again the American farm, to strengthen the family farm.” (Associated Press)

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**FILE** A protester dressed as Big Bird stands Oct. 6, 2012, outside of the amphitheater in Apopka Fla., where Republican presidential candidate Mitt Romney prepares to speak during a campaign rally. (Associated Press)

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**FILE** Republican presidential candidate Mitt Romney speaks Oct. 3, 2012, during the first presidential debate with President Obama at the University of Denver. (Associated Press)

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A person dressed as Big Bird holds a sign Oct. 8, 2012, outside Republican presidential candidate Mitt Romney's headquarters in Derry, N.H., where House Speaker John Boehner of Ohio was about to speak to supporters. (Associated Press)

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Republican presidential candidate Mitt Romney speaks during a campaign rally on Monday, Oct. 8, 2012, in Newport News, Va. (AP Photo/Evan Vucci)

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Gladys Plympton, 91, shields herself from the rain before Republican presidential candidate Mitt Romney takes the stage for a campaign stop on Monday, Oct. 8, 2012, in Newport News, Va. (AP Photo/Jason Hirschfeld)