Mitt Romney

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Republican presidential candidate Mitt Romney speaks Oct. 10, 2012, during a town hall meeting at Ariel Corporation in Mt. Vernon, Ohio. (Associated Press)

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Republican presidential candidate Mitt Romney speaks Oct. 9, 2012, during a campaign rally in Cuyahoga Falls, Ohio. (Associated Press)

Romney supporter Jayne Whetstone (left) of Menlo, Iowa, talks with members of Iowa Citizens for Community Improvement Action Fund who are dressed in "Sesame Street" costumes outside a campaign stop for Republican presidential candidate Mitt Romney at the Koch family farm on Tuesday, Oct. 9, 2012, in Van Meter, Iowa. (AP Photo/Charlie Neibergall)

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Supporters of Republican presidential candidate Mitt Romney listen to him speak during a campaign rally on Tuesday, Oct. 9, 2012, in Van Meter, Iowa. (AP Photo/Evan Vucci)

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Republican presidential candidate Mitt Romney talks with patrons at a Wendy's restaurant after making a surprise visit on Tuesday, Oct. 9, 2012, in Cuyahoga Falls, Ohio. (AP Photo/Evan Vucci)

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Republican presidential candidate Mitt Romney and Sen. Chuck Grassley (right), Iowa Republican, wave before Mr. Romney spoke at a campaign stop at the Koch family farm on Tuesday, Oct. 9, 2012, in Van Meter, Iowa. (AP Photo/Charlie Neibergall)

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

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Republican presidential candidate Mitt Romney speaks during a campaign rally on Tuesday, Oct. 9, 2012, in Van Meter, Iowa. (AP Photo/Evan Vucci)

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Republican presidential candidate Mitt Romney greets supporters after speaking at a campaign stop at the Koch family farm on Tuesday, Oct. 9, 2012, in Van Meter, Iowa. (AP Photo/Charlie Neibergall)

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Supporters wave flags during Republican Mitt Romney's campaign stop on Oct. 9, 2012, in Van Meter, Iowa. (AP Photo/Charlie Neibergall)

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Republican presidential candidate Mitt Romney speaks during a campaign stop at the Koch family farm on Tuesday, Oct. 9, 2012, in Van Meter, Iowa. (AP Photo/Charlie Neibergall)

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Republican presidential candidate Mitt Romney asks his staff for their orders after stopping at a Wendy's restaurant on Tuesday, Oct. 9, 2012, in Cuyahoga Falls, Ohio. (AP Photo/Evan Vucci)

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Republican presidential candidate Mitt Romney walks into a Wendy's restaurant during a surprise stop on Tuesday, Oct. 9, 2012, in Cuyahoga Falls, Ohio. (AP Photo/Evan Vucci)

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Republican presidential candidate Mitt Romney (center) and New Jersey Gov. Chris Christie (left) arrive at a campaign rally after being introduced by Ohio Lt. Gov. Mary Taylor on Tuesday, Oct. 9, 2012, in Cuyahoga Falls, Ohio. (AP Photo/Evan Vucci)

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Republican presidential candidate Mitt Romney (left) is introduced by New Jersey Gov. Chris Christie (right) as Ohio Lt. Gov. Mary Taylor watches during a campaign rally on Tuesday, Oct. 9, 2012, in Cuyahoga Falls, Ohio. (AP Photo/Evan Vucci)

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Republican presidential candidate Mitt Romney campaigns with New Jersey Gov. Chris Christie (center) and Sen. Rob Portman (right), Ohio Republican, in Cuyahoga Falls, Ohio, on Tuesday, Oct. 9, 2012. (AP Photo/Mark Stahl)