Bob DiGregorio, a supporter of Republican presidential candidate, Texas Gov. Rick Perry, leaves a caucus training session held at the Sheraton on Jan. 3, 2012 in West Des Moines, Iowa. After months of campaigning by candidates, Iowan voters throughout the state prepare to participate in the first caucus of the 2012 presidential election.

Republican presidential candidate Rick Santorum is surrounded by the media after a campaign stop in Des Moines, Iowa on Jan. 3, 2012, the day of the Iowa caucus.

Republican presidential candidate Mitt Romney, flanked by staff members, greets Iowa voters at a campaign event at the Temple for Performing Arts in Des Moines, Iowa, on Jan. 3, 2012.

Republican presidential candidate and U.S. Representative Michele Bachmann stands with her daughter, Caroline Bachmann, and Iowa's 5th congressional district U.S. Representative Steve King during a news conference in West Des Moines, Iowa, on Jan. 3, 2012.

A Newt Gingrich supporter holds two postcards of Gingrich while listening to him speak at Elly's Tea and Coffee in Muscatine, Iowa, on Jan. 3, 2012.

Republican presidential candidate Ron Paul greets supporters during a campaign stop in West Des Moines, Iowa on Jan. 3, 2012.

Republican presidential candidate, former House Speaker Newt Gingrich, accompanied by his wife Callista, makes remarks during a campaign stop in Independence, Iowa, Monday, Jan. 2.

Republican presidential candidate and former Speaker of the House Newt Gingrich wipes away a tear while speaking about his deceased mother during a question and answer forum put together by Moms Matter 2012 at Java Joe's, a coffee shop, on Dec. 30, 2011 in Des Moines, Iowa. The GOP presidential contenders are crisscrossing Iowa in the final stretch of campaigning in the state before the January 3rd caucus, the first test the candidates must face before becoming the Republican presidential nominee.

Left to right, Dan Greteman and his daughter Kiran Greteman, 9, of West Des Moines; David Lister of Cumming, Georgia; and Greg Finch and his children Lizzy Finch, 8, and Ben Finch, 7, of Waukee, Iowa, wait for the arrival of former Massachusetts Governor and Republican presidential candidate Mitt Romney before the start of a campaign rally at a Hy Vee supermarket Dec. 30, in West Des Moines, Iowa. Despite cold wind and rain, hundreds of Romney supporters came out to see the candidate just days before the "first in the nation" Iowa Caucuses.

Marcella Yochum, center, and her son Scott Yochum of West Des Moines take shelter under a camoflauge sleeping bag while waiting for the arrival of former Massachusetts Governor and Republican presidential candidate Mitt Romney before the start of a campaign rally at a Hy Vee supermarket December 30, 2011 in West Des Moines, Iowa.

Republican presidential candidate U.S. Rep. Michele Bachmann (R-MN) dances with 9-year old Shayne Holmes before a "meet and greet" campaign event December 29, 2011 in Marshalltown, Iowa. Earlier in the day, Bachmann charged that the campaign of U.S. Rep. Ron Paul had offered money to one of her key Iowa supporters, Kent Sorenson. "Kent Sorenson personally told me he was offered a large sum of money to go to work for the Paul campaign," Bachmann said in a statement.

Alyse Ivers watches a Ron Paul staffer on the phone during a veterans' rally for Ron Paul at the Knapp Learning Center on the State Fair Grounds in Des Moines, Iowa, on Dec. 28, 2011.

Supporters of presidential hopeful U.S. Rep Ron Paul (R-TX) attempt to block Occupy Wall Street protesters who are disrupting a campaign event at the Iowa State Fairgrounds on Dec. 28, 2011 in Des Moines, Iowa. With less than one week to go before the Iowa caucuses, Ron Paul is trying to maintain his lead as he campaigns through Iowa.

Occupy Des Moines protesters block the entrance of Republican presidential candidate and former Massachusetts Governor Mitt Romney's office in Des Moines, Iowa Dec. 28, 2011.

A protester is arrested for blocking the entrance to Republican presidential candidate Mitt Romney's local campaign office during an Occupy The Caucus demonstration in Des Moines, Dec. 28, 2011.

Members of the audience look on as Republican presidential candidates participate in the debate in Sioux City, Iowa, on Dec. 15, 2011.

Republican presidential candidates Mitt Romney and Newt Gingrich pose before the Republican Party presidential candidates' debate in Sioux City, Iowa, on Dec. 15, 2011.