Mitt Romney

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Republican presidential candidate Mitt Romney greets supporters following a campaign stop in Council Bluffs, Iowa, on Friday, June 8, 2012. (AP Photo/Nati Harnik)

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney speaks June 8, 2012, during a campaign stop in Council Bluffs, Iowa. (Associated Press)

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** FILE ** Presumptive Republican presidential nominee Mitt Romney campaigns in St. Louis. Now that the primaries are effectively over, Mr. Romney has turned his attention to fundraising. (Associated Press)

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney gestures June 7, 2012, during a campaign stop at Production Products in St. Louis, Mo. (Associated Press)

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This combination of Associated Press photos shows President Obama speaking May 24, 2012, at the TPI Composites Factory, a manufacturer of wind turbine blades, in Newton, Iowa, and Republican presidential candidate Mitt Romney speaking May 31, 2012, at the Solyndra manufacturing facility in Fremont, Calif. (Associated Press)

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** FILE ** Republican presidential candidate and former Massachusetts Gov. Mitt Romney speaks May 29, 2012, during a campaign event at the Somers Furniture warehouse in Las Vegas. (Associated Press)

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Former Massachusetts Gov. Mitt Romney, the presumptive Republican presidential candidate, holds a baby as he greets supporters after speaking at a campaign event in Craig, Colo., on Tuesday. (Associated Press)

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney speaks May 29, 2012, during a campaign event at the Somers Furniture warehouse in Las Vegas. (Associated Press)

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Republican presidential candidate Mitt Romney speaks Tuesday in Craig, Colo., where he lambasted President Obama for his record on job creation and a perceived hostility toward business. (Associated Press)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney walks past Donald Trump's airplane as he arrives in Las Vegas, Tuesday, May 29, 2012. (AP Photo/Mary Altaffer)