Republican presidential candidate, former Massachusetts Gov. Mitt Romney listens while greeting people in the audience at a campaign event in Tunkhannock, Pa.., Thursday, April 5, 2012. (AP Photo/Steven Senne)

Associated Press
Republican presidential candidate, former Massachusetts Gov. Mitt Romney listens while greeting people in the audience at a campaign event in Tunkhannock, Pa.., Thursday, April 5, 2012. (AP Photo/Steven Senne)
Republican presidential candidate, former Massachusetts Gov. Mitt Romney listens while greeting people in the audience at a campaign event in Tunkhannock, Pa.., Thursday, April 5, 2012. (AP Photo/Steven Senne)
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