Republican presidential candidate, former Massachusetts Gov. Mitt Romney greets supporters after speaking at a campaign stop, Tuesday, May 15, 2012, in Des Moines, Iowa. (AP Photo/Charlie Neibergall)

Associated Press
Republican presidential candidate, former Massachusetts Gov. Mitt Romney greets supporters after speaking at a campaign stop, Tuesday, May 15, 2012, in Des Moines, Iowa. (AP Photo/Charlie Neibergall)
Republican presidential candidate, former Massachusetts Gov. Mitt Romney greets supporters after speaking at a campaign stop, Tuesday, May 15, 2012, in Des Moines, Iowa. (AP Photo/Charlie Neibergall)
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