Mitt Romney

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Former Massachusetts Gov. Mitt Romney waves after speaking at the Defending the American Dream Summit in Washington on Nov. 4, 2011. (Associated Press)

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Former Massachusetts Gov. Mitt Romney shakes hands after a town hall meeting in Exeter, N.H., on Thursday (Associated Press)

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Former Massachusetts Gov. Mitt Romney speaks during an economic roundtable at the Treynor State Bank in Treynor, Iowa, on Thursday. (Associated Press)

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Former Massachusetts Gov. Mitt Romney, a Republican presidential candidate, exits after speaking at an event in Des Moines, Iowa, in May. "I'd love to win Iowa, any of us would. I will be here again and again, campaigning here," Mr. Romney said recently in Sioux City. (Associated Press)

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** FILE ** Businessman Herman Cain (left), former Massachusetts Gov. Mitt Romney (center) and Texas Gov. Rick Perry are pictured before a Republican presidential debate on Tuesday, Oct. 18, 2011, in Las Vegas. (AP Photo/Isaac Brekken)

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ASSOCIATED PRESS Virginia Gov. Bob McDonnell (right), with Republican presidential candidate Mitt Romney in Fairfax on Wednesday, faces ballooning Medicaid costs in his state.

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Former Massachusetts Gov. Mitt Romney, a candidate for the Republican presidential nomination, greets volunteers at a call center at the Fairfax County Republican Committee headquarters in Fairfax, Va., on Wednesday, Oct. 26, 2011. (AP Photo/Pablo Martinez Monsivais)

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Gov. Chris Christie's popularity has dipped since the New Jersey Republican decided not to run for president and instead endorsed former Massachusetts Gov. Mitt Romney.

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney talks to supporters in front of the State House in Concord, N.H., on Oct. 24, 2011, after filing his papers to be on the ballot for the state's presidential primary. (Associated Press)

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Republican presidential candidate former Massachusetts Gov. Mitt Romney speaks Thursday during an economic roundtable at the Treynor State Bank in Treynor, Iowa. He promised to return “again and again, campaigning here. I'd love to win Iowa. Any of us would.” (Associated Press)

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Republican presidential candidates Herman Cain, left, shakes hands with Texas Gov. Rick Perry, right, as former Massachusetts Gov. Mitt Romney looks on before a Republican presidential debate Tuesday, Oct. 18, 2011, in Las Vegas. (AP Photo/Isaac Brekken)

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Former Massachusetts Gov. Mitt Romney makes his point during a Republican presidential debate on Oct. 11, 2011, at Dartmouth College in Hanover, N.H. (Associated Press)

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Republican presidential candidate Herman Cain speaks Tuesday night as former Massachusetts Gov. Mitt Romney listens during a GOP debate at Dartmouth College in Hanover, N.H. (Associated Press)

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New Jersey Gov. Chris Christie (left) endorses former Massachusetts Gov. Mitt Romney (right) for the GOP presidential nomination on Oct. 11, 2011, during a news conference in Lebanon, N.H. (Associated Press)

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Former Sen. Judd Gregg, New Hampshire Republican, is one of two GOP ex-lawmakers who Monday threw their support behind Mitt Romney, a former governor of neighboring Massachusetts, in his bid for the 2012 Republican presidential nod. (Associated Press)

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Former Massachusetts Gov. Mitt Romney speaks at the Values Voter Summit in Washington, Saturday, Oct. 8, 2011. (AP Photo/Manuel Balce Ceneta)

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Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks to Citadel cadets and supporters during a campaign speech inside Mark Clark Hall on The Citadel campus in Charleston, S.C., Friday, Oct. 7, 2011. (AP Photo/Mic Smith)

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Republican presidential candidates from left, former New Mexico Gov. Gary Johnson, former Pennsylvania Sen. Rick Santorum, former House Speaker Newt Gingrich, Rep. Ron Paul, R-Texas, Texas Gov. Rick Perry, former Massachusetts Gov. Mitt Romney, Rep. Michele Bachmann, R-Minn, businessman Herman Cain and former Utah Gov. Jon Huntsman gather prior to a debate, Thursday, Sept. 22, 2011, in Orlando, Fla. (AP Photo/Phelan M. Ebenhack, Pool)

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney speaks on Oct. 6, 2011, to supporters aboard the USS Yorktown at Patriots Point in Charleston, S.C. (Associated Press/The Post and Courier)

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** FILE ** Republican presidential candidate Texas Gov. Rick Perry answers a question as Republican presidential candidate former Massachusetts Gov. Mitt Romney listens during a Republican presidential candidate debate at the Reagan Library Wednesday, Sept. 7, 2011, in Simi Valley, Calif. (AP Photo/Jae C. Hong)