Mitt Romney

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney speaks to a crowd April 11, 2012, during a campaign event in Warwick, R.I. (Associated Press)

Republican presidential candidate, former Massachusetts Gov. Mitt Romney is interviewed by Martha MacCallum, co-anchor of "America's Newsroom" on the Fox News Channel in New York, Wednesday, April 11, 2012. On Tuesday, Romney made clear that he would assault Obama's character as well, saying the president is not inept at economic policy, but he actively dislikes business. (AP Photo/Richard Drew)

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney smiles as he is introduced April 10, 2012, by Sen. Pat Toomey, Pennsylvania Republican, at the spring reception for the Republican Committee of Chester County in Mendenhall, Pa. (Associated Press)

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Republican presidential hopeful Mitt Romney speaks at a campaign stop at R.C. Fabricators on Tuesday in Wilmington, Del., where he met with a group of female business owners. R.C. Fabricators designs and erects structural steel. (Associated Press)

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**FILE** Republican presidential candidate and former Massachusetts Gov. Mitt Romney talks Feb. 1, 2012, to reporters on his campaign plane en route from Tampa, Fla. to Minnesota and Nevada. (Associated Press)

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Republican presidential candidate Mitt Romney and his wife, Ann, wave as they leave at an election-night rally on Tuesday, March 20, 2012, after winning the Illinois primary. (AP Photo/Nam Y. Huh)

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Republican presidential candidate Mitt Romney speaks in Tunkhannock, Pa., on Thursday, April 5, 2012. (AP Photo/Steven Senne)

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GOP presidential hopeful Mitt Romney campaigns Thursday in Tunkhannock, Pa. The former Massachusetts governor said he expects to "pick up a lot of delegates" in the Keystone State. (Associated Press)

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GOP presidential candidate Mitt Romney takes his turn speaking to the American Society of News Editors on Wednesday, a day after President Obama told his side of the story. (Associated Press)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks at the Newspapers Association of America/American Society of News Editors luncheon gathering in Washington, Wednesday, April 4, 2012. (AP Photo/Manuel Balce Ceneta)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney greets people during a campaign stop at a Cousins Subs fast food restaurant, in Waukesha, Wis., Tuesday, April 3, 2012. (AP Photo/Steven Senne)

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney speaks to an audience April 1, 2012, during a campaign stop at a pancake breakfast in Milwaukee, Wis. (Associated Press)

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney (right) greets people April 1, 2012, at a pancake breakfast during a campaign stop in Milwaukee, Wis. (Associated Press)

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Mitt Romney was an April fool when he was surprised by an empty room in Milwaukee. His staff members had gathered supporters in another room upstairs. Mr. Romney shared the story once he made it to the right room. (Associated Press)

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Republican presidential hopeful Mitt Romney chats it up Tuesday with Jay Leno on "The Tonight Show." His aides are said to have cautioned him: “Don't try and be funny.” (NBC-TV via Associated Press)

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney speaks April 1, 2012, to a crowd at a town-hall style campaign event in Madison, Wis. (Associated Press)

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In this photo provided by NBC, Republican presidential candidate, former Massachusetts Gov. Mitt Romney talks with Jay Leno during his appearance on "The Tonight Show" in Burbank, Calif., Tuesday, March 27, 2012. (AP Photo/NBC, Paul Drinkwater)

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Former Massachusetts Gov. Mitt Romney, a Republican presidential candidate, meets with former President George H.W. Bush in Houston on Thursday to receive his endorsement. Mr. Bush, who talked with the hopeful in his office, called Mr. Romney a "good man" who would "make a great president." (Associated Press)

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Former Massachusetts Gov. Mitt Romney (right), front-runner for the GOP presidential nod, seen here Dec. 1 with former President George H.W. Bush in Houston, will get Mr. Bush's formal endorsement Thursday. (Associated Press)

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** FILE ** In this Dec. 1, 2011, file photo, Republican presidential candidate, former Massachusetts Gov. Mitt Romney meets with former President George H.W. Bush in Houston. (AP Photo/Pat Sullivan, File)