Mitt Romney

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney, from right, Rep. Michele Bachmann, R-Minn., and Virginia Gov. Bob McDonnell arrive at a campaign stop in Portsmouth, Va., Thursday, May 3, 2012. (AP Photo/Jae C. Hong)

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney holds the hands of Rep. Michele Bachmann, Minnesota Republican, on May 3, 2012, at a campaign stop in Portsmouth, Va. (Associated Press)

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While 5-year-old Braden Jones (at left) of Leesburg, Va., plays on the floor, Republican presidential candidate Mitt Romney makes a campaign stop at Exhibit Edge in Chantilly, Va., on Wednesday, May 2, 2012. (Barbara L. Salisbury/The Washington Times)

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Republican presidential candidate Mitt Romney talks to supporters at Exhibit Edge in Chantilly, Va., on Wednesday, May 2, 2012. (Barbara L. Salisbury/The Washington Times)

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Republican presidential candidate Mitt Romney speaks at a campaign stop in Chantilly, Va., on Wednesday, May 2, 2012. (AP Photo/Jae C. Hong)

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Republican presidential candidate Mitt Romney (right), accompanied by former New York Mayor Rudy Giuliani, talks to reporters in front of Engine 24, Ladder 5, in New York on Tuesday, May 1, 2012. (AP Photo/Jae C. Hong)

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Supporters of President Obama hold signs April 30, 2012, near a campaign stop for Republican presidential candidate and former Massachusetts Gov. Mitt Romney in Portsmouth, N.H. (Associated Press)

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney talks April 27, 2012, to students during a roundtable discussion at Otterbein University in Westerville, Ohio. (Associated Press)

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FILE - In this April 27, 2012, file photo Republican presidential candidate, former Massachusetts Gov. Mitt Romney waves after speaking at Otterbein University in Westerville, Ohio. “I'm absolutely convinced that this nation is the greatest nation on earth, and it is so because of the American people, a people who stand united when called upon by leaders to be united,” Romney said, offering unusually measured remarks, even for the former businessman's standards, mentioning Obama by name only a handful of times. “I will try and unite the American people, not divide us.” (AP Photo/Jae C. Hong, File)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney — accompanied by Ohio Gov. John Kasich, left, and student Kelsey Gorman — listens during a roundtable discussion at Otterbein University in Westerville, Ohio, Friday, April 27, 2012. (AP Photo/Jae C. Hong)

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Voters of all stripes say the economy and job growth are their top priorities, something that Republican presidential hopeful Mitt Romney sees as an advantage in his bid to unseat the incumbent president. (Associated Press)