Mitt Romney

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks at Charlotte Pipe and Foundry Company in Charlotte, N.C., Friday, May 11, 2012. (AP Photo/Jae C. Hong)

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney greets supporters May 10, 2012, during a campaign stop in Omaha, Neb. (Associated Press/Omaha World-Herald)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney, talks with chief strategist Stuart Stevens on his campaign bus as they drive from Naples, Fla., to Hialeah, Fla., Sunday, Jan. 29, 2012. (AP Photo/Charles Dharapak)

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Former Massachusetts Gov. Mitt Romney, the presumptive GOP presidential nominee, speaks at a campaign stop at KP Kauffman Co., an oil and gas production and drilling company, in Fort Lupton, Colo., on Wednesday, May 9, 2012. (AP Photo/Jae C. Hong)

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Former Massachusetts Gov. Mitt Romney, the presumptive Republican presidential nominee, speaks at Lansing Community College in Lansing, Mich., on Tuesday, May 8, 2012. (AP Photo/Carlos Osorio)

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Former Massachusetts Gov. Mitt Romney, the presumptive Republican presidential nominee, speaks at a town-hall-style meeting in Euclid, Ohio, on Monday, May 7, 2012. (AP Photo/Jae C. Hong)

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** FILE ** In this Feb. 22, 2012, photo Republican presidential candidate and former Massachusetts Gov. Mitt Romney, right, talks with fellow candidate, former Pennsylvania Sen. Rick Santorum, after a presidential debate in Arizona. On Monday night, May 7, 2012, Santorum endorsed Romney, saying "above all else" they agree that Obama must be defeated. (AP Photo/Jae C. Hong, File)

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney speaks May 7, 2012, at a town hall style meeting in Euclid, Ohio. (Associated Press)

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney speaks May 7, 2012, at a town hall style meeting in Euclid, Ohio. (Associated Press)

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney holds a towel next to his, wife Ann, before an NBA first-round playoff series basketball game between the Boston Celtics and the Atlanta Hawks in Boston, Sunday, May 6, 2012. (AP Photo/Michael Dwyer)

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** FILE ** Republican presidential candidate, former Massachusetts Gov. Mitt Romney, greets supporters during a campaign stop in Portsmouth, Va., on Thursday, May 3, 2012. (AP Photo/Virginian-Pilot, Ross Taylor)