Mitt Romney

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Former Massachusetts Gov. Mitt Romney speaks at a GOP presidential campaign rally in Flint, Mich., on Saturday, Feb. 25, 2012. (AP Photo/Gerald Herbert)

Campaign signs for Republican presidential candidate, former Pennsylvania Sen. Rick Santorum, cover the frozen ground as the campaign bus carrying Republican presidential candidate, former Massachusetts Gov. Mitt Romney, passes by en route to a campaign stop at the San Marino Club, Saturday, Feb. 25, 2012, in Troy, Mich. (AP Photo/Eric Gay)

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Republican presidential candidate Mitt Romney speaks on Friday, Feb. 24, 2012, to the Detroit Economic Club at Ford Field in Detroit. (Associated Press)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney, autographs a baseball as he greets the crowd after a Tea Party town hall event in Milford, Mich., Thursday, Feb. 23, 2012. (AP Photo/Carlos Osorio)

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Former Massachusetts Gov. Mitt Romney gestures during a Republican presidential debate Wednesday, Feb. 22, 2012, in Mesa, Ariz. (AP Photo/Jae C. Hong)

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** FILE ** Republican presidential candidates (from left) Rep. Ron Paul of Texas, former Pennsylvania Sen. Rick Santorum, former Massachusetts Gov. Mitt Romney and former House Speaker Newt Gingrich share the stage Feb. 22, 2012, during a GOP presidential debate in Mesa, Ariz. (Associated Press)

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Former Massachusetts Gov. Mitt Romney gestures during a Republican presidential debate Wednesday, Feb. 22, 2012, in Mesa, Ariz. (AP Photo/Jae C. Hong)

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Former Massachusetts Gov. Mitt Romney (right) and former Pennsylvania Sen. Rick Santorum argue a point Feb. 22, 2012, during a Republican presidential debate in Mesa, Ariz. (Associated Press)

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Former House Speaker Newt Gingrich, right, greets Rep. Ron Paul of Texas, second from left, as former Pennsylvania Sen. Rick Santorum, left, and former Massachusetts Gov. Mitt Romney watch before the start of a Republican presidential debate Wednesday, Feb. 22, 2012, in Mesa, Ariz. (AP Photo/Jae C. Hong)

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Former Massachusetts Gov. Mitt Romney speaks at a town hall meeting at Eagle Manufacturing Corp. in Shelby Township, Mich., Tuesday, Feb. 21, 2012. (AP Photo/Gerald Herbert)

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Republican presidential candidate Mitt Romney pauses while speaking to a group of former Salt Lake City Winter Olympics committee members in Salt Lake City on Saturday, Feb. 18, 2012, to mark the 10th anniversary of the games. (AP Photo/Gerald Herbert)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney, speaks to a group of former Salt Lake City Olympic committee members, at an event marking the tenth anniversary of the games, in Salt Lake City, Utah, Saturday, Feb. 18, 2012. (AP Photo/Gerald Herbert)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney, speaks to a group of former Salt Lake City Olympic committee members, at an event marking the tenth anniversary of the games, in Salt Lake City, Utah, Saturday, Feb. 18, 2012. Behind is his wife Ann. (AP Photo/Gerald Herbert)

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FILE - In this Oct. 1, 2001, file photo Mitt Romney, president of the Salt Lake Organizing Committee, announces there are 70,000 additional tickets available for purchase for the 2002 Winter Games during a news conference in Salt Lake City. Romney will put his time running the Olympics back in the spotlight Saturday, Feb. 18, 2012, when he speaks at a major celebration honoring the 10-year anniversary of the games. (AP Photo/Douglas C. Pizac, File)

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** FILE ** Republican presidential candidates, from left, former Pennsylvania Sen. Rick Santorum, former House Speaker Newt Gingrich, former Massachusetts Gov. Mitt Romney and Rep. Ron Paul, R-Texas, look toward moderator Wolf Blitzer of CNN as they participate in the Republican presidential candidates debate in Jacksonville, Fla., Thursday, Jan. 26, 2012. (AP Photo/Matt Rourke)