Mitt Romney

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Republican presidential candidate Mitt Romney laughs as he meets supporters at Cherokee Trike and More in Greer, S.C., Thursday, Jan. 12, 2012. (AP Photo/Spartanburg Herald-Journal, Michael Justus)

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** FILE ** Former Massachusetts Gov. Mitt Romney, a Republican presidential candidate, campaigns at Cherokee Trike and More in Greer, S.C., on Thursday. (Associated Press)

Republican presidential candidate and former Massachusetts Gov. Mitt Romney speaks Jan. 12, 2012, during a campaign stop at the Palm Beach Convention Center in West Palm Beach, Fla. (Associated Press)

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney campaigns Jan. 12, 2012, at Cherokee Trike and More in Greer, S.C. (Associated Press/Spartanburg Herald-Journal)

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Former Massachusetts Gov. Mitt Romney campaigns for the Republican presidential nomination at the Hall at Senate’s End in Columbia, S.C., on Wednesday, Jan. 11, 2012. (AP Photo/Charles Dharapak)

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Former Massachusetts Gov. Mitt Romney and South Carolina Gov. Nikki R. Haley campaign at the Hall at Senate's End in Columbia, S.C., on Wednesday. Mr. Romney took aim at President Obama on the stump, saying he is in "over his head." (Associated Press)

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Republican presidential hopeful Mitt Romney boards his campaign plane Wednesday in Bedford, Mass., heading for South Carolina, site of the next primary contest on Jan. 21. His strong stance against illegal immigration dovetails with South Carolina's tough new law. (Associated Press)

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Former Massachusetts Gov. Mitt Romney celebrates his win in the New Hampshire primary election in Manchester, N.H., on Tuesday, Jan. 10, 2012. (AP Photo/Charles Dharapak)

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New Hampshire Speaker of the House Bill O'Brien join supporters of Republican presidential candidate, former House Speaker Newt Gingrich as they listen to Republican presidential candidate, former Massachusetts Gov. Mitt Romney claim victory in the New Hampshire presidential primary Tuesday, Jan. 10, 2012, in Manchester, N.H. (AP Photo/Jim Cole)

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Former Massachusetts Gov. Mitt Romney hugs his wife Ann as his sons, Tagg, Craig, Ben and Josh (L-R) look on during the Romney for President New Hampshire primary night victory party at Southern New Hampshire University in Manchester, N.H., Tuesday, Jan. 10, 2012. (AP Photo/Elise Amendola)

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Supporters of Republican presidential candidate, former Massachusetts Gov. Mitt Romney, react as it was declared that he was the winner of the New Hampshire primary rlection at his reception in Manchester, N.H., Tuesday, Jan. 10, 2012. (AP Photo/Charles Dharapak)

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Former Massachusetts Gov. Mitt Romney reaches for his wife Ann as his sons, Josh, Ben, Craig, Tagg and Matt (L-R) look on during the Romney for President New Hampshire primary night rally at Southern New Hampshire University in Manchester, N.H., Tuesday, Jan. 10, 2012. (AP Photo/Charles Dharapak)

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Former Massachusetts Gov. Mitt Romney and his Ann greet supporters at the Romney for President New Hampshire primary night victory party at Southern New Hampshire University in Manchester, N.H., Tuesday, Jan. 10, 2012. (AP Photo/Elise Amendola)

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** FILE ** Former Massachusetts Gov. Mitt Romney waves to supporters at the Romney for President New Hampshire primary night rally at Southern New Hampshire University in Manchester, N.H., on Tuesday, Jan. 10, 2012. Behind Mr. Romney are his sons Tagg (left) and Craig and his wife, Ann. (AP Photo/Elise Amendola)

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Former Massachusetts Gov. Mitt Romney campaigns for the Republican presidential nomination at McKelvie Intermediate School in Bedford, N.H., on Monday, Jan. 9, 2012. (AP Photo/Charles Dharapak)

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With his family behind him, former Massachusetts Gov. Mitt Romney campaigns for the Republican presidential nomination at McKelvie Intermediate School in Bedford, N.H., on Monday, Jan. 9, 2012. (AP Photo/Charles Dharapak)

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** FILE ** Six candidates vying for the Republican presidential nomination — (from left) former Utah Gov. Jon Huntsman, former Pennsylvania Sen. Rick Santorum, former Massachusetts Gov. Mitt Romney, Texas Rep. Ron Paul, former House Speaker Newt Gingrich and Texas Gov. Rick Perry — are introduced before a GOP presidential candidate debate at the Capitol Center for the Arts in Concord, N.H., on Sunday, Jan. 8, 2012. (AP Photo/Charles Krupa)

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With two days before the nation's first presidential primary, Republican presidential candidate and former Massachusetts Governor Mitt Romney responds to a man in crowd after sharing the stage and spotlight with New Jersey Governor Chris Christie during a rally at Exeter High School in Exeter, NH, Sunday, January 8, 2012. (Rod Lamkey Jr/ The Washington Times)

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Family members of Republican presidential candidate and former Massachusetts Governor Mitt Romney join him on stage during a rally at Exeter High School. (Rod Lamkey Jr/ The Washington Times)

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Republican presidential candidate and former Massachusetts Governor Mitt Romney is joined by his wife Ann Romney on stage. (Rod Lamkey Jr/ The Washington Times)