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Image 2 of 30 Rick Perry and former Speaker of the House Newt Gingrich shake hands after the Republican presidential debate airing on CNN, October 18, 2011 in Las Vegas. Rick Perry and former Speaker of the House Newt Gingrich shake hands after the Republican presidential debate airing on CNN, October 18, 2011 in Las Vegas. Photo: Ethan Miller / Getty

Image 3 of 30 Texas Gov. Rick Perry is introduced prior to a debate at Constitution Hall November 22, 2011 in Washington, DC. Texas Gov. Rick Perry is introduced prior to a debate at Constitution Hall November 22, 2011 in Washington, DC. Photo: Win McNamee / Getty

Image 4 of 30 Texas Gov. Rick Perry speaks during the ABC News GOP Presidential debate on the campus of Drake University on December 10, 2011 in Des Moines, Iowa. Texas Gov. Rick Perry speaks during the ABC News GOP Presidential debate on the campus of Drake University on December 10, 2011 in Des Moines, Iowa. Photo: Kevork Djansezian / Getty

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Image 6 of 30 Rick Perry speaks during the GOP debate on the campus of Drake University on December 10, 2011 in Des Moines, Iowa. Rick Perry speaks during the GOP debate on the campus of Drake University on December 10, 2011 in Des Moines, Iowa. Photo: Pool / Getty

Image 7 of 30 Texas Gov. Rick Perry answers a question during a Republican presidential candidate debate at Saint Anselm College in Manchester, N.H., Saturday, Jan. 7, 2012. Texas Gov. Rick Perry answers a question during a Republican presidential candidate debate at Saint Anselm College in Manchester, N.H., Saturday, Jan. 7, 2012. Photo: Elise Amendola / Associated Press

Image 8 of 30 Rick Perry participates in the ABC News, Yahoo! News, and WMUR Republican Presidential Debate at Saint Anselm College January 7, 2012 in Manchester, N.H. Rick Perry participates in the ABC News, Yahoo! News, and WMUR Republican Presidential Debate at Saint Anselm College January 7, 2012 in Manchester, N.H. Photo: Win McNamee / Getty Images

Image 9 of 30 Rick Perry points to a member of the audience during a break in the Republican presidential candidate debate at Saint Anselm College in Manchester, N.H., Saturday, Jan. 7, 2012. Rick Perry points to a member of the audience during a break in the Republican presidential candidate debate at Saint Anselm College in Manchester, N.H., Saturday, Jan. 7, 2012. Photo: Elise Amendola / Associated Press

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Image 11 of 30 Rick Perry answers a question as Newt Gingrich listens in the background during a Republican presidential candidate debate at the Capitol Center for the Arts in Concord, N.H., Sunday, Jan. 8, 2012. Rick Perry answers a question as Newt Gingrich listens in the background during a Republican presidential candidate debate at the Capitol Center for the Arts in Concord, N.H., Sunday, Jan. 8, 2012. Photo: Charles Krupa / Associated Press

Image 12 of 30 Texas Gov. Rick Perry and his fellow Republican presidential candidates walk on the stage and are greeted by moderator David Gregory prior to the NBC News Facebook Debate on 'Meet the Press' January 8, 2012 at the Capitol Center for the Arts in Concord, N.H. less Texas Gov. Rick Perry and his fellow Republican presidential candidates walk on the stage and are greeted by moderator David Gregory prior to the NBC News Facebook Debate on 'Meet the Press' January 8, 2012 at ... more Photo: Alex Wong / Getty Images

Image 13 of 30 Rick Perry and Newt Gingrich speak during a commercial break in the South Carolina Republican presidential candidate debate Monday, Jan. 16, 2012, in Myrtle Beach, S.C. Rick Perry and Newt Gingrich speak during a commercial break in the South Carolina Republican presidential candidate debate Monday, Jan. 16, 2012, in Myrtle Beach, S.C. Photo: David Goldman / Associated Press

Image 14 of 30 Rick Perry, Rick Santorum, Mitt Romney, Newt Gingrich, and Ron Paul pose for a photos before participating in a Fox News, Wall Street Journal sponsored debate at the Myrtle Beach Convention Center, on January 16, 2012 in Myrtle Beach, S.C. less Rick Perry, Rick Santorum, Mitt Romney, Newt Gingrich, and Ron Paul pose for a photos before participating in a Fox News, Wall Street Journal sponsored debate at the Myrtle Beach Convention Center, on January ... more Photo: Mark Wilson / Getty Images

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Image 16 of 30 Rick Perry, Rick Santorum, Mitt Romney, Newt Gingrich and Ron Paul take the stage for the Fox News debate at the Myrtle Beach Convention Center on Monday, Jan. 16, 2012 in Myrtle Beach, S.C. Rick Perry, Rick Santorum, Mitt Romney, Newt Gingrich and Ron Paul take the stage for the Fox News debate at the Myrtle Beach Convention Center on Monday, Jan. 16, 2012 in Myrtle Beach, S.C. Photo: Janet Blackmon Morgan / Associated Press

Image 17 of 30 Mitt Romney and Rick Perry speak during a Republican presidential debate in Las Vegas. Mitt Romney and Rick Perry speak during a Republican presidential debate in Las Vegas. Photo: Chris Carlson / Associated Press

Image 18 of 30 Mitt Romney and Rick Perry spar during a Republican presidential debate in Las Vegas. Mitt Romney and Rick Perry spar during a Republican presidential debate in Las Vegas. Photo: Chris Carlson / Associated Press

Image 19 of 30 Rick Perry speaks during a Republican presidential candidate debate at the Reagan Library Wednesday, Sept. 7, 2011, in Simi Valley, Calif. Rick Perry speaks during a Republican presidential candidate debate at the Reagan Library Wednesday, Sept. 7, 2011, in Simi Valley, Calif. Photo: Jae C. Hong / Associated Press

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Image 21 of 30 Rick Perry and Mitt Romney share a laugh during a Fox News/Google debate Thursday, Sept. 22, 2011, in Orlando, Fla. Rick Perry and Mitt Romney share a laugh during a Fox News/Google debate Thursday, Sept. 22, 2011, in Orlando, Fla. Photo: Phelan M. Ebenhack / Associated Press

Image 22 of 30 Rick Perry and Ron Paul talk before the start of the Republican presidential candidate debate at the Reagan Library Wednesday, Sept. 7, 2011, in Simi Valley, Calif. Rick Perry and Ron Paul talk before the start of the Republican presidential candidate debate at the Reagan Library Wednesday, Sept. 7, 2011, in Simi Valley, Calif. Photo: Jae C. Hong / Associated Press

Image 23 of 30 Rick Perry stands at his podium as he prepares for the Republican debate, Saturday, Dec. 10, 2011, in Des Moines, Iowa. Rick Perry stands at his podium as he prepares for the Republican debate, Saturday, Dec. 10, 2011, in Des Moines, Iowa. Photo: Charlie Neibergall / Associated Press

Image 24 of 30 Rick Perry prepares for a presidential debate sponsored by Bloomberg and The Washington Post at Dartmouth College in Hanover, N.H., Tuesday, Oct. 11, 2011. Rick Perry prepares for a presidential debate sponsored by Bloomberg and The Washington Post at Dartmouth College in Hanover, N.H., Tuesday, Oct. 11, 2011. Photo: Scott Eells / Associated Press

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Image 26 of 30 Rick Perry and Ron Paul, R-Texas are seen before a Republican presidential debate at Oakland University in Auburn Hills, Mich., Wednesday, Nov. 9, 2011. Rick Perry and Ron Paul, R-Texas are seen before a Republican presidential debate at Oakland University in Auburn Hills, Mich., Wednesday, Nov. 9, 2011. Photo: Paul Sancya / Associated Press

Image 27 of 30 Herman Cain and Rick Perry talk before a Republican presidential debate at Oakland University in Auburn Hills, Mich., Wednesday, Nov. 9, 2011. Herman Cain and Rick Perry talk before a Republican presidential debate at Oakland University in Auburn Hills, Mich., Wednesday, Nov. 9, 2011. Photo: Paul Sancya / Associated Press

Image 28 of 30 Rick Perry, Rick Santorum, Mitt Romney, Newt Gingrich and Ron Paul pose for a photo at the start of the South Carolina Republican presidential candidate debate Monday, Jan. 16, 2012, in Myrtle Beach, S.C. Rick Perry, Rick Santorum, Mitt Romney, Newt Gingrich and Ron Paul pose for a photo at the start of the South Carolina Republican presidential candidate debate Monday, Jan. 16, 2012, in Myrtle Beach, S.C. Photo: David Goldman / Associated Press

Image 29 of 30 Rick Perry and Mitt Romney talk prior to the Republican debate, Saturday, Dec. 10, 2011, in Des Moines, Iowa. Rick Perry and Mitt Romney talk prior to the Republican debate, Saturday, Dec. 10, 2011, in Des Moines, Iowa. Photo: Charlie Neibergall / Associated Press