Mitt Romney

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Republican presidential candidate Mitt Romney greets supporters at a caucus, Saturday, Feb. 11, 2012, in Portland, Maine. (AP Photo/Robert F. Bukaty)

** FILE ** In this Jan. 23, 2012, file photo, Republican presidential candidates, Rep. Ron Paul, R-Texas, right, and former Massachusetts Gov. Mitt Romney share a laugh during a break in a Republican presidential debate at the University of South Florida in Tampa, Fla. (AP Photo/Chris O'Meara, File)

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Republican Presidential Candidate and former Massachusetts Gov. Mitt Romney speaks at the Conservative Political Action Conference (CPAC) held at the Marriott Wardman Park, Washington, D.C., Friday, February 10, 2012. The annual political conference draws thousands of supporters and prominent conservative figures. (Andrew Harnik/The Washington Times)

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A member of the audience listens to Republican Presidential Candidate and former Massachusetts Gov. Mitt Romney speak at the Conservative Political Action Conference (CPAC) held at the Marriott Wardman Park, Washington, D.C., Friday, February 10, 2012. The annual political conference draws thousands of supporters and prominent conservative figures. (Andrew Harnik/The Washington Times)

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** FILE ** Former Massachusetts Gov. Mitt Romney, the front-runner for the Republican presidential nomination, speaks at the Conservative Political Action Conference (CPAC) at the Marriott Wardman Park in Washington on Friday, Feb. 10, 2012. (Andrew Harnik/The Washington Times)

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Republican Presidential Candidate and former Massachusetts Gov. Mitt Romney speaks at the Conservative Political Action Conference (CPAC) held at the Marriott Wardman Park, Washington, D.C., Friday, February 10, 2012. The annual political conference draws thousands of supporters and prominent conservative figures. (Andrew Harnik/The Washington Times)

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A supporter listens to Republican Presidential Candidate and former Massachusetts Gov. Mitt Romney speak at the Conservative Political Action Conference (CPAC) held at the Marriott Wardman Park, Washington, D.C., Friday, February 10, 2012. The annual political conference draws thousands of supporters and prominent conservative figures. (Andrew Harnik/The Washington Times)

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Republican Presidential Candidate and former Massachusetts Gov. Mitt Romney speaks at the Conservative Political Action Conference (CPAC) held at the Marriott Wardman Park, Washington, D.C., Friday, February 10, 2012. The annual political conference draws thousands of supporters and prominent conservative figures. (Andrew Harnik/The Washington Times)

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Republican Presidential Candidate Mitt Romney speaks at the Conservative Political Action Conference (CPAC) held at the Marriott Wardman Park, Washington, D.C., Friday, Feb. 10, 2012. The annual political conference draws thousands of supporters and prominent conservative figures. (Andrew Harnik/The Washington Times)

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney addresses the Conservative Political Action Conference (CPAC) in Washington on Feb. 10, 2012. (Associated Press)

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney speaks Feb. 8, 2012, at a campaign rally in Atlanta. (Associated Press)

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Republican presidential candidate Mitt Romney tried to attract voters more interested in social issues before Tuesday's contests in Minnesota, Missouri and Colorado. He failed to win any of the three. (AP Photo/Gerald Herbert)

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney speaks Feb. 7, 2012, at his Colorado caucus night rally in Denver. (Associated Press)

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Children wait to shake hands with Republican presidential candidate Mitt Romney in Loveland, Colo., on Tuesday, a day for caucuses in Colorado and Minnesota. (Associated Press)

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BIG MOMENT: Children wait to shake hands with Republican presidential candidate Mitt Romney at a campaign rally in Loveland, Colo., on Tuesday, a day for caucuses in Colorado and Minnesota. Critics say it's time to take a look at the value of caucuses. (Associated Press)

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Republican presidential hopeful Mitt Romney greets supporters Monday at a rally in Grand Junction, Colo. Though favored to win Colorado's caucuses, the former Massachusetts governor is taking nothing for granted, with a fundraiser planned in Cherry Hills Village and rally set for Centennial. (Associated Press)