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    An audience member uses his iPad to record video of Republican presidential candidate, former Massachusetts Gov. Mitt Romney, as he campaigned at the University of South Carolina Aiken, in Aiken, S.C., Friday, Jan. 13, 2012. (AP Photo/Charles Dharapak)
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    Republican presidential candidate, former Massachusetts Gov. Mitt Romney, picks up nine-week-old Laura Ensley from Augusta, Ga., as her mother, Mary Ensley watches at center, as he campaigns at the University of South Carolina Aiken, in Aiken, S.C., Friday, Jan. 13, 2012. (AP Photo/Charles Dharapak)
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    Republican presidential candidate, former Massachusetts Gov. Mitt Romney, campaigns at the University of South Carolina Aiken, in Aiken, S.C., Friday, Jan. 13, 2012. (AP Photo/Charles Dharapak)
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    Republican presidential candidate, former Massachusetts Gov. Mitt Romney, campaigns at the University of South Carolina Aiken, in Aiken, S.C., Friday, Jan. 13, 2012. (AP Photo/Charles Dharapak)
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    Republican presidential candidate, former Pennsylvania Sen. Rick Santorum meets with patrons at the Cook Out restaurant, Friday, Jan. 13, 2012, in Gaffney, S.C. (AP Photo/Matt Rourke)
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    Republican presidential candidate, former Massachusetts Gov. Mitt Romney, campaigns in Hilton Head, S.C., Friday, Jan. 13, 2012. (AP Photo/Charles Dharapak)
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    Republican presidential candidate, former Massachusetts Gov. Mitt Romney, right, Sen. John McCain, R-Ariz., center, and former United Nations Ambassador John Bolton, left, laugh as they campaign in Hilton Head, S.C., Friday, Jan. 13, 2012. (AP Photo/Charles Dharapak)
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    John McAllister, of Blufton, S.C., listens as Republican presidential candidate former Massachusetts Gov. Mitt Romney's speech is played on speakers to overflow crowds gathering outside a hotel ballroom during a campaign stop Friday, Jan. 13, 2012, in Hilton Head, S.C. (AP Photo/David Goldman)
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    Republican presidential candidate former Pennsylvania Sen. Rick Santorum supporters Chuck Fields, right, and Jeff Morgan wave to traffic before an forum at Byrnes High School, Friday, Jan. 13, 2012, in Duncan, S.C. (AP Photo/Matt Rourke)
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    A couple leave a campaign event featuring Republican presidential candidate former Massachusetts Gov. Mitt Romney at a beach side resort Friday, Jan. 13, 2012, in Hilton Head, S.C. (AP Photo/David Goldman)
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    Republican presidential candidate former House Speaker Newt Gingrich speaks to members of the media after a GOP forum at Byrnes High School, Friday, Jan. 13, 2012, in Duncan, S.C. (AP Photo/Matt Rourke)
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    Republican presidential candidate former Pennsylvania Sen. Rick Santorum looks on as former House Speaker Newt Gingrich takes part in a GOP forum at Byrnes High School, Friday, Jan. 13, 2012, in Duncan, S.C. (AP Photo/Matt Rourke)
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    Republican presidential candidate, former Pennsylvania Sen. Rick Santorum, meets patrons of Tommy's Ham House, Saturday, Jan. 14, 2012, during a campaign event in Greenville, S.C. (AP Photo/Matt Rourke)
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    Republican presidential candidate, former Pennsylvania Sen. Rick Santorum, meets patrons of Tommy's Ham House, Saturday, Jan. 14, 2012, during a campaign event in Greenville, S.C. (AP Photo/Matt Rourke)
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    Abby Brooks, 18, of Charlotte, N.C., looks on as Republican presidential candidate Texas Gov. Rick Perry speaks during a campaign stop Saturday, Jan. 14, 2012, in Mt. Pleasant, S.C. (AP Photo/David Goldman)
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    A patron of Tommy's Ham House touches a Greenville, S.C., newspaper sporting front page images of Republican presidential candidates, former Pennsylvania Sen. Rick Santorum and former House Speaker Newt Gingrich, as Santorum campaigns at the restaurant Saturday, Jan. 14, 2012, in Greenville, S.C. (AP Photo/Matt Rourke)
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    Republican presidential candidate Texas Gov. Rick Perry waits to be introduced at a campaign stop Saturday, Jan. 14, 2012, in Mt. Pleasant, S.C. (AP Photo/David Goldman)
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    Republican presidential candidate, Texas Gov. Rick Perry, speaks at Page's Okra Grill during a campaign stop Saturday, Jan. 14, 2012, in Mt. Pleasant, S.C. (AP Photo/David Goldman)
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    Republican presidential candidate Texas Gov. Rick Perry waits to be introduced at a campaign stop Saturday, Jan. 14, 2012, in Mt. Pleasant, S.C. (AP Photo/David Goldman)
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    Campaign volunteer Erik Corcoran, right, talks with patrons at Page's Okra Grill before a visit by Republican presidential candidate Texas Gov. Rick Perry Saturday, Jan. 14, 2012, in Mt. Pleasant, S.C. (AP Photo/David Goldman)
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    Republican presidential candidate, Texas Gov. Rick Perry, gestures while campaigning in Mt. Pleasant, S.C., Saturday, Jan. 14, 2012. (AP Photo/David Goldman)
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    Patrons of Tommy's Ham House listen as Republican presidential candidate former Pennsylvania Sen. Rick Santorum campaigns at the Greenville, S.C., restaurant Saturday, Jan. 14, 2012. (AP Photo/Matt Rourke)
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    Republican presidential candidate former Pennsylvania Sen. Rick Santorum campaigns at Tommy's Ham House adjacent to a portrait of Gen. Robert E. Lee, Saturday, Jan. 14, 2012, in Greenville, S.C. (AP Photo/Matt Rourke)
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    Republican presidential candidate Texas Gov. Rick Perry arrives at Page's Okra Grill following a campaign stop Saturday, Jan. 14, 2012, in Mt. Pleasant, S.C. (AP Photo/David Goldman)
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    Republican presidential candidate, former Massachusetts Gov. Mitt Romney (L) and South Carolina Gov. Nikki Haley, a Republican, laugh as they listen to U.S. Sen. John McCain (R-AZ) speak during a campaign rally at the Hilton Oceanfront Resort on January 13, 2012 in Hilton Head Island, South Carolina. Romney continues to campaign for votes in South Carolina ahead of their primary on January 21. (Photo by Joe Raedle/Getty Images)
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    Republican presidential candidate, former Speaker of the House Newt Gingrich speaks with the media as he arrives for a Huckabee forum on January 14, 2012 in Charleston, South Carolina. Republican presidential candidates continue to campaign for votes in South Carolina ahead of their primary on January 21st. (Photo by Joe Raedle/Getty Images)
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    Republican presidential candidate, former Speaker of the House Newt Gingrich arrives for a Huckabee forum on January 14, 2012 in Charleston, South Carolina. Republican presidential candidates continue to campaign for votes in South Carolina ahead of their primary on January 21st. (Photo by Joe Raedle/Getty Images)
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    Republican presidential candidate, Texas Gov. Rick Perry speaks during a campaign stop at Page's Okra Grill January 14, 2012 in Mt. Pleasant, South Carolina. Voters in South Carolina will head to the polls on January 21st. to vote in the primary election to pick their choice for U.S. presidential candidate. (Photo by Mark Wilson/Getty Images)
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    Republican presidential candidate, Texas Gov. Rick Perry speaks during a campaign stop at Page's Okra Grill January 14, 2012 in Mt. Pleasant, South Carolina. Voters in South Carolina will head to the polls on January 21st. to vote in the primary election to pick their choice for U.S. presidential candidate. (Photo by Mark Wilson/Getty Images)
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    Chuck Fields holds a campaign sign for Republican presidential candidate, former U.S. Sen. Rick Santorum outside of the Spartanburg GOP Bronze Elephant Dinner, January 13, 2012 in Duncan, South Carolina. Voters in South Carolina will head to the polls on January 21 to vote in the primary election for the Republican presidential candidate. (Photo by Mark Wilson/Getty Images)
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    Republican presidential candidate, Texas Gov. Rick Perry speaks during a campaign stop at Page's Okra Grill January 14, 2012 in Mt. Pleasant, South Carolina. Voters in South Carolina will head to the polls on January 21st. to vote in the primary election to pick their choice for U.S. presidential candidate. (Photo by Mark Wilson/Getty Images)
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    Republican presidential candidate, Texas Gov. Rick Perry greets supporters at Page's Okra Grill January 14, 2012 in Mt. Pleasant, South Carolina. Voters in South Carolina will head to the polls on January 21st. to vote in the primary election to pick their choice for U.S. presidential candidate. (Photo by Mark Wilson/Getty Images)
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    Republican presidential hopeful Mitt Romney speaks during his campaign appearance on Hilton Head Island, S.C. on Friday, Jan. 13, 2012. (AP Photo/The Island Packet, Jay Karr)
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    Republican presidential candidate, former Speaker of the House Newt Gingrich is offered a bottle of water from a young boy after speaking at the Spartanburg GOP Bronze Elephant Dinner at Byrnes High School January 13, 2012 in Duncan, South Carolina. Voters in South Carolina will head to the polls on January 21 to vote in the primary election for the Republican presidential candidate. (Photo by Mark Wilson/Getty Images)
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    Republican presidential candidate, former Massachusetts Gov. Mitt Romney, campaigns in Hilton Head, S.C., Friday, Jan. 13, 2012. (AP Photo/Charles Dharapak)
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    Republican presidential candidate, former U.S. Sen. Rick Santorum (R) waits for Republican presidential candidate, former Speaker of the House Newt Gingrich (L) to finish his speech during the Spartanburg GOP Bronze Elephant Dinner at Byrnes High School January 13, 2012 in Duncan, South Carolina. Voters in South Carolina will head to the polls on January 21 to vote in the primary election for the Republican presidential candidate. (Photo by Mark Wilson/Getty Images)
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    Republican presidential candidate, former Massachusetts Gov. Mitt Romney, campaigns in Hilton Head, S.C., Friday, Jan. 13, 2012. (AP Photo/Charles Dharapak)
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    Republican presidential candidate, former U.S. Sen. Rick Santorum leaves Popes at the White House restaurant after a campaign stop, January 13, 2012 in York, South Carolina. Voters in South Carolina will head to the polls on January 21st. to vote in the primary election to pick their choice for U.S. presidential candidate. (Photo by Mark Wilson/Getty Images)
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    Republican presidential candidate, former U.S. Sen. Rick Santorum (R) arrives at Popes at the White House restaurant during a campaign stop, January 13, 2012 in York, South Carolina. Voters in South Carolina will head to the polls on January 21st. to vote in the primary election to pick their choice for U.S. presidential candidate. (Photo by Mark Wilson/Getty Images)
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    Republican presidential candidate, former U.S. Sen. Rick Santorum walks up to greet people during a campaign stop at Popes at the White House restaurant, January 13, 2012 in York, South Carolina. Voters in South Carolina will head to the polls on January 21st. to vote in the primary election to pick their choice for U.S. presidential candidate. (Photo by Mark Wilson/Getty Images)
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