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

Associated Press
Republican presidential candidate, former Massachusetts Gov. Mitt Romney greets supporters after speaking at a campaign stop at the Koch Family Farm, Tuesday, Oct. 9, 2012, in Van Meter, Iowa. (AP Photo/Charlie Neibergall)
Republican presidential candidate, former Massachusetts Gov. Mitt Romney greets supporters after speaking at a campaign stop at the Koch Family Farm, Tuesday, Oct. 9, 2012, in Van Meter, Iowa. (AP Photo/Charlie Neibergall)
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