Mitt Romney

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney holds a baby May 29, 2012, while greeting supporters after a campaign event in Craig, Colo. (Associated Press)

Republican presidential candidate and former Massachusetts Gov. Mitt Romney looks out the campaign charter airplane window on May 28, 2012, during a flight between San Diego and Hayden, Co. (Associated Press)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks in Hillsborough, N.H., Friday, May 18, 2012. (AP Photo/Mary Altaffer)

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Republican presidential candidate Mitt Romney speaks at the Latino Coalition's annual economic summit at the U.S. Chamber of Commerce in Washington on Wednesday, May 23, 2012. (AP Photo/Evan Vucci)

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Republican presidential candidate Mitt Romney and Salina Beattie display work they did together in a sixth grade language arts class during Mr. Romney's visit to Universal Bluford Charter School in West Philadelphia, Pa. His statement that "just getting smaller classrooms didn't seem to be the key" to improving education was challenged. (Associated Press)

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Republican presidential candidate Mitt Romney addresses the Latino Coalition's 2012 Small Business Summit on Wednesday, May 23, 2012, in Washington. (AP Photo/Mary Altaffer)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney addresses the Latino Coalition's 2012 Small Business Summit, Wednesday, May 23, 2012, in Washington. (AP Photo/Mary Altaffer)

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Republican presidential candidate Mitt Romney said that "millions of children are getting a Third World-education" in the U.S. and that he supports school choice initiatives. He held up the voucher system in the District of Columbia Public Schools as a model that could be used nationwide. He spoke Wednesday before the Latino Coalition's 2012 Small Business Summit in Washington. (Associated Press)

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** FILE ** In this May 8, 2012 photo, Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks in Lansing, Mich. Romney padded his lead in the race for convention delegates in Republican presidential primaries Tuesday in Arkansas and Kentucky as he inches closer to the nomination he's all but certain to win. (AP Photo/Carlos Osorio, File)

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Former Massachusetts Gov. Mitt Romney and his aides have struggled to respond consistently to intensifying criticism about his tenure at Bain Capital and how it would be reflected in his presidency. President Obama sharply attacked Mr. Romney's business career Monday. (Associated Press)

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Ann Romney, left, wife of Republican presidential candidate, former Massachusetts Gov. Mitt Romney and Mary Pat Christie, wife of New Jersey Gov. Chris Christie. (AP Photo/Stephan Savoia)