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Republican presidential candidate, former Massachusetts Gov. Mitt Romney (Credit: AP)

Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks at the closed National Gypsum drywall factory in Lorain, Ohio. (April 19, 2012)

GOP candidates campaign, debate

Photos of Republican presidential candidates on the campaign trail and at the debates to decide the GOP's 2012 nominee.

Republican presidential candidate, former Massachusetts Gov. Mitt Romney,
(Credit: AP)

Republican presidential candidate, former Massachusetts Gov. Mitt Romney, accompanied by by Sen. Marco Rubio, R-Fla., talks to reporters in Aston, Pa. (April 23, 2012)

Republican presidential candidate, former Massachusetts Gov. Mitt Romney
(Credit: AP)

Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks at the closed National Gypsum drywall factory in Lorain, Ohio. (April 19, 2012)

Republican presidential candidate Ron Paul, speaks at Soldier
(Credit: AP)

Republican presidential candidate Ron Paul, speaks at Soldier & Sailors Memorial Hall in Oakland section of Pittsburgh, Pa. (April 20, 2012)

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Republican presidential candidate, former House Speaker Newt Gingrich
(Credit: AP)

Republican presidential candidate, former House Speaker Newt Gingrich waves to supporters as he leaves a campaign stop in Buffalo, N.Y. (April 20, 2012)

Republican presidential candidate, former House Speaker Newt Gingrich
(Credit: AP)

Republican presidential candidate, former House Speaker Newt Gingrich speaks at the National Rifle Association convention in St. Louis. (April 13, 2012)

Republican presidential candidate Rep. Ron�Paul, R-Texas, waves to
(Credit: AP)

Republican presidential candidate Rep. Ron�Paul, R-Texas, waves to supporters after speaking at the University of California at Berkeley, Calif. (April 5, 2012)

Republican presidential candidate Newt Gingrich addresses a campaign
(Credit: Getty Images)

Republican presidential candidate Newt Gingrich addresses a campaign town hall-style meeting at the Hodson Auditorium on the campus of Hood College in Frederick, Md. (April 2, 2012)

Republican presidential candidate Ron Paul arrives at a
(Credit: AP)

Republican presidential candidate Ron Paul arrives at a campaign event at the University of Wisconsin campus in Madison, Wis. (March 29, 2012)

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With his daughter, Elizabeth, at his side, Republican
(Credit: Getty Images)

With his daughter, Elizabeth, at his side, Republican presidential candidate Rick Santorum discusses his plan for free-market health care solutions during a campaign stop at the MacDonald and Owens Lumber Company in Sparta, Wisc. (March 28, 2012)

Republican presidential candidate Rick Santorum takes a phone
(Credit: AP )

Republican presidential candidate Rick Santorum takes a phone call after finishing lunch at the Mineshaft during a campaign stop in Hartford, Wisc. (March 27, 2012)

Republican presidential candidate Newt Gingrich speaks during a
(Credit: AP )

Republican presidential candidate Newt Gingrich speaks during a campaign stop at Salisbury University in Salisbury, Md. (March 27, 2012)

Republican presidential candidate Mitt Romney speaks at NuVasive,
(Credit: AP )

Republican presidential candidate Mitt Romney speaks at NuVasive, Inc., a medical device company in San Diego, Calif. (March 26, 2012)

Republican presidential candidate Newt Gingrich, speaks during the
(Credit: AP)

Republican presidential candidate Newt Gingrich, speaks during the Pennsylvania Leadership Conference in Camp Hill, Pa. (March 24, 2012)

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Republican presidential candidate Ron Paul leaves the stage
(Credit: AP )

Republican presidential candidate Ron Paul leaves the stage after speaking at a Campus Town Hall Meeting at Southeastern Louisiana University in Hammond, La. (March 23, 2012)

Republican presidential candidate Newt Gingrich displays an etch-a-sketch
(Credit: AP)

Republican presidential candidate Newt Gingrich displays an etch-a-sketch during a Tea Party Presidential forum and straw poll hosted by the LSU College Republicans in Baton Rouge, La. (March 22, 2012)

Republican presidential candidate Mitt Romney greets supporters during
(Credit: AP )

Republican presidential candidate Mitt Romney greets supporters during a campaign stop at an American Legion post in Arbutus, Md. (March 21, 2012)

Republican presidential candidate Rick Santorum holds an Etch-A-Sketch
(Credit: AP )

Republican presidential candidate Rick Santorum holds an Etch-A-Sketch during a rally in Mandeville, La. (March 21, 2012)

Republican presidential candidate Newt Gingrich speaks at a
(Credit: AP )

Republican presidential candidate Newt Gingrich speaks at a town hall meeting at Louisiana Tech University in Ruston, La. (March 20, 2012)

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Republican presidential candidate, former Pennsylvania Sen. Rick Santorum
(Credit: AP)

Republican presidential candidate, former Pennsylvania Sen. Rick Santorum speaks during a campaign rally in Bellevue, Wis., March 24, 2012.

Republican presidential candidate, former Pennsylvania Sen. Rick Santorum
(Credit: AP Photo/Jae C. Hong)

Republican presidential candidate, former Pennsylvania Sen. Rick Santorum bowls after a campaign rally in Sheboygan, Wis., Saturday, March 24, 2012. (AP Photo/Jae C. Hong)

Republican presidential candidate, former Pennsylvania Sen. Rick Santorum,
(Credit: AP)

Republican presidential candidate, former Pennsylvania Sen. Rick Santorum, center, shakes hands with supporters during a campaign rally in Bellevue, Wis., March 24, 2012.

Republican presidential candidate, former Pennsylvania Sen. Rick Santorum,
(Credit: AP)

Republican presidential candidate, former Pennsylvania Sen. Rick Santorum, center, poses with supporters during a campaign rally in Bellevue, Wis., March 24, 2012.

Republican presidential candidate Mitt Romney addresses the audience
(Credit: AP)

Republican presidential candidate Mitt Romney addresses the audience during a campaign stop in Metairie, La. (March 23, 2012)

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Republican presidential candidate Mitt Romney addresses the audience
(Credit: AP)

Republican presidential candidate Mitt Romney addresses the audience during a campaign event near a natural gas drilling rig in Shreveport, La. (March 23, 2012)

Republican presidential candidate Newt Gingrich speaks at a
(Credit: AP)

Republican presidential candidate Newt Gingrich speaks at a rally in Brandon, Miss. (March 11, 2012)

Republican presidential candidate Rick Santorum reacts after throwing
(Credit: AP)

Republican presidential candidate Rick Santorum reacts after throwing a strike while bowling after a campaign rally in Sheboygan, Wis. (March 24, 2012)

Republican Presidential candidate Rick Santorum speaks during the
(Credit: AP)

Republican Presidential candidate Rick Santorum speaks during the Pennsylvania Leadership Conference in Camp Hill, Pa. (March 24, 2012)

Republican presidential candidate Newt Gingrich talks with members
(Credit: AP)

Republican presidential candidate Newt Gingrich talks with members of the Hispanic community at a private residence at Oakland Plantation Estates in Kenner, La. (March 23, 2012)

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Republican presidential candidate Newt Gingrich speaks during a
(Credit: Getty Images)

Republican presidential candidate Newt Gingrich speaks during a campaign stop at the Pennsylvania Leadership Conference in Camp Hill, Pa. (March 24, 2012)

Republican presidential candidate, Rep. Ron Paul, R-Texas speaks
(Credit: AP)

Republican presidential candidate, Rep. Ron Paul, R-Texas speaks to an enthusiastic crowd of supporters inside the University Center on the Southeastern Louisiana University campus in Hammond, La. (March 23, 2012)

Republican presidential candidate Rick Santorum waves an Etch-A-Sketch
(Credit: AP)

Republican presidential candidate Rick Santorum waves an Etch-A-Sketch while criticizing the policies of rival GOP presidential candidate Mitt Romney at a rally in Shreveport, La. (March 23, 2012)

Republican presidential candidate Rick Santorum speaks at a
(Credit: AP)

Republican presidential candidate Rick Santorum speaks at a campaign rally in West Monroe, La. (March 23, 2012)

Republican presidential candidate Mitt Romney speaks at Charlie
(Credit: AP )

Republican presidential candidate Mitt Romney speaks at Charlie Parker's Diner in Springfield, Ill. (March 19, 2012)

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Republican presidential candidate Rick Santorum, left, shakes hands
(Credit: AP )

Republican presidential candidate Rick Santorum, left, shakes hands with supporters during a campaign appearance at Herrin High School in Herrin, Ill. (March 17, 2012)

Republican presidential candidate Mitt Romney holds a town
(Credit: Getty Images)

Republican presidential candidate Mitt Romney holds a town hall-style meeting at the Sullivan Community Center Gymnasium in Vernon Hills, Ill. (March 18, 2012)

Republican presidential candidate Newt Gingrich address supporters gathered
(Credit: AP)

Republican presidential candidate Newt Gingrich address supporters gathered at a local restaurant in New Orleans. (March 16, 2012)

Republican presidential candidate Ron Paul talks to the
(Credit: AP )

Republican presidential candidate Ron Paul talks to the media after a rally at the University of Missouri. (March 15, 2012)

Republican presidential candidate Newt Gingrich speaks at a
(Credit: AP )

Republican presidential candidate Newt Gingrich speaks at a rally in Rosemont, Ill. (March 14, 2012)

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Republican presidential candidate Rick Santorum walks to his
(Credit: AP)

Republican presidential candidate Rick Santorum walks to his vehicle following a campaign stop at Sweet Peppers Deli in Tupelo, Miss. (March 11, 2012)

Republican presidential candidate Rick Santorum, left, visits with
(Credit: AP)

Republican presidential candidate Rick Santorum, left, visits with 21-month-old Lucy Polsgrove at Sweet Peppers Deli in Tupelo, Miss. (March 11, 2012)

Republican presidential candidate Ron Paul autographs a poster
(Credit: AP )

Republican presidential candidate Ron Paul autographs a poster at a caucus site at Shawnee Mission Northwest High School in Shawnee, Kan. (March 10, 2012)

Republican presidential candidate Ron Paul speaks during a
(Credit: AP)

Republican presidential candidate Ron Paul speaks during a rally in Topeka, Kan. (March 9, 2012)

Republican presidential candidate Mitt Romney kisses a baby
(Credit: AP)

Republican presidential candidate Mitt Romney kisses a baby as he makes a campaign stop at Thompson Tractor in Tarrant, Ala. (March 9, 2012)

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Republican presidential candidate Mitt Romney listens as Randy
(Credit: AP )

Republican presidential candidate Mitt Romney listens as Randy Owen of the band Alabama sings "My Home's in Alabama" during a campaign stop in Tarrant, Ala. (March 9, 2012)

Republican presidential candidate Newt Gingrich, accompanied by his
(Credit: AP)

Republican presidential candidate Newt Gingrich, accompanied by his wife Callista, speaks at a rally in Jackson, Miss. (March 8, 2012)

Republican presidential candidate Rick Santorum speaks at the
(Credit: AP)

Republican presidential candidate Rick Santorum speaks at the U.S. Space and Rocket Center in Huntsville, Ala. (March 8, 2012)

Republican presidential candidate and Mitt Romney, center, and
(Credit: Getty Images)

Republican presidential candidate and Mitt Romney, center, and his wife Ann Romney talk to members of his staff aboard his campaign plane on Super Tuesday. (March 6, 2012)

Ann Romney, wife of Republican presidential candidate, former
(Credit: AP )

Ann Romney, wife of Republican presidential candidate, former Massachusetts Gov. Mitt Romney, wipes lipstick off his face after kissing him at a campaign rally in Zanesville, Ohio, Monday, March 5, 2012.

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Republican presidential candidate Rep. Ron Paul, R-Texas, speaks
(Credit: AP)

Republican presidential candidate Rep. Ron Paul, R-Texas, speaks to supporters during a town hall meeting at the Bonner County Fairgrounds in Sandpoint, Idaho. (March 5, 2012)

Republican presidential candidate Rep. Ron Paul, R-Texas, speaks
(Credit: AP)

Republican presidential candidate Rep. Ron Paul, R-Texas, speaks to supporters in Fairbanks, Alaska. (March 4, 2012)

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