Ronald Reagan Presidential Library

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Republican presidential candidate Mitt Romney shares a light moment Wednesday during the Republican presidential candidate debate at the Reagan Library in Simi Valley, Calif. For now, he has relinquished his front-runner status to main rival Texas Gov. Rick Perry. (Associated Press)

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Republican presidential candidate Mitt Romney shares a light moment Wednesday during the Republican presidential candidate debate at the Reagan Library in Simi Valley, Calif. For now, he has relinquished his front-runner status to main rival Texas Gov. Rick Perry. (Associated Press)

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Texas Gov. Rick Perry (left), former Utah Gov. Jon Huntsman (center) and Rep. Ron Paul, Texas Republican, talk Sept. 7, 2011, during a break at the Republican presidential candidate debate at the Reagan Library in Simi Valley, Calif. (Associated Press)

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Texas Gov. Rick Perry (left) and Rep. Ron Paul, Texas Republican, talk Sept. 7, 2011, during a break at a Republican presidential candidates debate at the Reagan Library in Simi Valley, Calif. (Associated Press)

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PARTY POLITICS: Former Massachusetts Gov. Mitt Romney (left) and Texas Gov. Rick Perry spar during a Wednesday debate held at the Reagan Library in Simi Valley, Calif., among eight Republicans seeking the 2012 GOP presidential nod. (Associated Press)

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** FILE ** Republican presidential candidate businessman Herman Cain speaks during a Republican presidential candidate debate at the Reagan Library Wednesday, Sept. 7, 2011, in Simi Valley, Calif. (AP Photo/Jae C. Hong)

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Republican presidential candidate Texas Gov. Rick Perry speaks during a Republican presidential candidate debate at the Reagan Library Wednesday, Sept. 7, 2011, in Simi Valley, Calif. (AP Photo/Jae C. Hong)

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Republican presidential candidate Rep. Ron Paul, R-Texas, speaks during a Republican presidential candidate debate at the Reagan Library Wednesday, Sept. 7, 2011, in Simi Valley, Calif. (AP Photo/Jae C. Hong)

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Republican presidential candidate former Utah Gov. Jon Huntsman speaks during a Republican presidential candidate debate at the Reagan Library Wednesday, Sept. 7, 2011, in Simi Valley, Calif. (AP Photo/Jae C. Hong)

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Republican presidential candidate former Sen. Rick Santorum speaks during a Republican presidential candidate debate at the Reagan Library Wednesday, Sept. 7, 2011, in Simi Valley, Calif. (AP Photo/Jae C. Hong)

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

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Republican presidential candidate Rep. Michele Bachmann, R-Minn., answers a question during a Republican presidential candidate debate at the Reagan Library Wednesday, Sept. 7, 2011, in Simi Valley, Calif. (AP Photo/Jae C. Hong)

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Republican presidential candidates, from left, Texas Gov. Rick Perry, former Massachusetts Gov. Mitt Romney, Rep. Michele Bachmann, R-Minn., and former Sen. Rick Santorum enter the hall for a Republican presidential candidate debate at the Reagan Library Wednesday, Sept. 7, 2011, in Simi Valley, Calif. (AP Photo/Chris Carlson)

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Republican presidential candidates Mitt Romney, left, Texas Gov. Rick Perry, center, and Rep. Ron Paul, R-Texas, take the stage before a Republican presidential candidate debate at the Reagan Library Wednesday, Sept. 7, 2011, in Simi Valley, Calif. (AP Photo/Chris Carlson)

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Republican presidential candidates Michele Bachmann, left, Mitt Romney, second from left, Rick Perry, second from right, and Ron Paul stand together before a Republican presidential candidate debate at the Reagan Library Wednesday, Sept. 7, 2011, in Simi Valley, Calif. (AP Photo/Chris Carlson)

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Republican presidential candidates, from left, former House Speaker Newt Gingrich, Rep. Michele Bachmann, R-Minn., former Massachusetts Gov. Mitt Romney, Texas Gov. Rick Perry, and Rep. Ron Paul, R-Texas., stand together before a Republican presidential candidate debate at the Reagan Library Wednesday, Sept. 7, 2011, in Simi Valley, Calif. (AP Photo/Chris Carlson)