Mitt Romney

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney waves as he arrives for a campaign rally at the closed National Gypsum drywall factory in Lorain, Ohio, Thursday, April 19, 2012. (AP Photo/Jae C. Hong)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney pauses while addressing supporters at his campaign stop in Charlotte, N.C., Wednesday, April 18, 2012. (AP Photo/Jae C. Hong)

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney speaks April 19, 2012, at the closed National Gypsum drywall factory in Lorain, Ohio. (Associated Press)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks at a campaign stop in Charlotte, N.C., Wednesday, April 18, 2012. (AP Photo/Chuck Burton)

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Former Massachusetts Gov. Mitt Romney, a Republican presidential candidate, gives the thumbs-up to supporters at a campaign stop in Charlotte, N.C., on Wednesday. Mr. Romney is in demand on the campaign trail as candidates for the Senate and House seek his help on the stump. (Associated Press)

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CNBC analyst Rick Santelli is an ideal running mate for GOP presidential hopeful Mitt Romney, according to Jeff Kahn, co-founder of Draft Santelli for President 2012. (CNBC)

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Republican presidential candidate Mitt Romney listens on Tuesday, April 17, 2012, during a meeting with a group of Pittsburgh-area residents in Bethel Park, Pa. (Associated Press)

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Democrats are going after Republican presidential candidate Mitt Romney by saying he is hiding the true political agenda he would pursue if elected president. They say he been all over the map on the issues and has exhibited a "penchant for secrecy." (Associated Press)

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney waves after speaking April 13, 2012, at the National Rifle Association convention in St. Louis. (Associated Press)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks at the National Rifle Association convention in St. Louis, Friday, April 13, 2012. (AP Photo/Michael Conroy)

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** FILE ** Republican presidential candidate and former Massachusetts Gov. Mitt Romney speaks to a crowd during a campaign event on April 11, 2012. (Associated Press)

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Vice President Joseph R. Biden in New Hampshire criticized Republican presidential front-runner Mitt Romney and congressional Republicans for opposing the so-called "Buffett rule," a minimum tax rate of 30 percent for people who make more than $1 million a year. (Associated Press)

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Ann Romney, wife of Republican presidential candidate Mitt Romney, was the target of criticism from a Democratic Party activist who said she "never worked a day in her life." The remark created a political firestorm that led to President Obama distancing himself from the comment. (Associated Press)