Mitt Romney

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** FILE ** Republican presidential candidate Mitt Romney meets with former President George H.W. Bush in Houston on Thursday, Dec. 1, 2011. (AP Photo/Pat Sullivan)

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Republican presidential candidate Mitt Romney talks with Jay Leno during his appearance on NBC's "The Tonight Show" in Burbank, Calif., on Tuesday, March 27, 2012. (AP Photo/NBC, Paul Drinkwater)

Republican presidential candidate former Pennsylvania Sen. Rick Santorum, waves a Etch-A-Sketch while criticizing the policies of GOP presidential candidate Mitt Romney at a rally in Shreveport, La., Friday, March 23, 2012. (AP Photo/Rogelio V. Solis)

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney addresses an audience March 23, 2012, during a campaign stop in Metairie, La. (Associated Press)

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Republican presidential candidate Mitt Romney addresses an audience on Wednesday, March 21, 2012, during a campaign stop at an American Legion post in Arbutus, Md. (Associated Press)

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Former Massachusetts Gov. Mitt Romney, a GOP presidential hopeful, addresses an audience during a campaign stop at an American Legion post in Arbutus, Md., on Wednesday. (Associated Press)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney waves as he speaks at an election night event in Schaumburg, Ill., Tuesday, March 20, 2012. Romney won the Illinois Primary. (AP Photo/Nam Y. Huh)

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Republican presidential candidate Mitt Romney leaves at an election-night event in Schaumburg, Ill., on Tuesday, March 20, 2012, after winning the Illinois primary. (AP Photo/Nam Y. Huh)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney and his wife Ann wave as they leave at an election night event in Schaumburg, Ill., Tuesday, March 20, 2012. Romney won the Illinois Primary. (AP Photo/Nam Y. Huh)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney reacts while greeting supporters at a rally in Schaumburg, Ill., after the winning the Illinois Republican presidential primary, Tuesday, March 20, 2012. (AP Photo/Steven Senne)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney, right, looks at a computer screen with Google employee Ted Souder, Tuesday, March 20, 2012, at the Chicago Google headquarters, in Chicago. (AP Photo/Steven Senne)

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In this March 19, 2012, photo, Republican Presidential candidate, former Massachusetts Gov. Mitt Romney greets supporters after speaking at the University of Chicago. (AP Photo/M. Spencer Green)

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Republican presidential hopeful Mitt Romney, speaking at the University of Chicago, said some of the nation's foremost inventors of an earlier era would have suffocated under the weight of the regulatory burden of today's federal government. (Associated Press)