Republican presidential candidate, former Massachusetts Gov. Mitt Romney pauses while speaking on the roof of an office building in Harrisburg, Pa., Thursday, April 5, 2012. (AP Photo/Steven Senne)

Associated Press
Republican presidential candidate, former Massachusetts Gov. Mitt Romney pauses while speaking on the roof of an office building in Harrisburg, Pa., Thursday, April 5, 2012. (AP Photo/Steven Senne)
Republican presidential candidate, former Massachusetts Gov. Mitt Romney pauses while speaking on the roof of an office building in Harrisburg, Pa., Thursday, April 5, 2012. (AP Photo/Steven Senne)
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