GOP debate at the Reagan Library (15 images)

The debate at the Ronald Reagan Presidential Library and Museum in Simi Valley, sponsored by NBC News and Politico, was the first time Perry and Romney have appeared together since the Texas governor entered the presidential race. U.S. Rep. Michele Bachmann of Minnesota, Rep. Ron Paul of Texas, former Sen. Rick Santorum of Pennsylvania, former House Speaker Newt Gingrich of Georgia, former U.S. Ambassador to China and ex-Utah Gov. Jon Huntsman Jr. and former Godfather Pizza Chief Executive Officer Herman Cain of Georgia also participated.

Presidential candidates Mitt Romney (L) and Rick Perry arrive on stage before the start of the Republican presidential primary debate at the Ronald Reagan Presidential Library in Simi Valley, California on September 7, 2011. UPI/Jim Ruymen

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Presidential candidates Michelle Bachman, Mitt Romney and Rick Perry (L-R) arrive on stage before the start of the Republican presidential primary debate at the Ronald Reagan Presidential Library in Simi Valley, California on September 7, 2011. UPI/Jim Ruymen

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Former first lady Nancy Reagan greets presidential candidates Jon Huntsman Jr. before the start of the Republican presidential primary debate at the Ronald Reagan Presidential Library in Simi Valley, California on September 7, 2011. UPI/Chris Carlson

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