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Republican presidential candidate, former Massachusetts Gov. Mitt Romney, center, flanked by campaign volunteers Jordan Furr, left, and Sherrie-Kaye Miller, both of Mechanicsburg, Pa., telephones a potential voter from a call center at his Pennsylvania campaign headquarters in Harrisburg, Pa., Thursday, April 5, 2012. (AP Photo/Steven Senne)

Associated Press
Republican presidential candidate, former Massachusetts Gov. Mitt Romney, center, flanked by campaign volunteers Jordan Furr, left, and Sherrie-Kaye Miller, both of Mechanicsburg, Pa., telephones a potential voter from a call center at his Pennsylvania campaign headquarters in Harrisburg, Pa., Thursday, April 5, 2012. (AP Photo/Steven Senne)
Republican presidential candidate, former Massachusetts Gov. Mitt Romney, center, flanked by campaign volunteers Jordan Furr, left, and Sherrie-Kaye Miller, both of Mechanicsburg, Pa., telephones a potential voter from a call center at his Pennsylvania campaign headquarters in Harrisburg, Pa., Thursday, April 5, 2012. (AP Photo/Steven Senne)
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