Republican presidential candidate, former Massachusetts Gov. Mitt Romney, greets people in the audience during a campaign stop in Muskego, Wis., Saturday, March 31, 2012. (AP Photo/Steven Senne)

Associated Press
Republican presidential candidate, former Massachusetts Gov. Mitt Romney, greets people in the audience during a campaign stop in Muskego, Wis., Saturday, March 31, 2012. (AP Photo/Steven Senne)
Republican presidential candidate, former Massachusetts Gov. Mitt Romney, greets people in the audience during a campaign stop in Muskego, Wis., Saturday, March 31, 2012. (AP Photo/Steven Senne)
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