Kevork Djansezian / AP Republican presidential contenders line up before the first primary debate at the Ronald Reagan Presidential Library and Museum in Simi Valley. They are, from left, Rep. Duncan Hunter of California, former Arkansas Gov. Mike Huckabee, former Virginia Gov. Jim Gilmore, former Massachusetts Gov. Mitt Romney, Sen. Sam Brownback of Kansas, Rep. Ron Paul of Texas, Rep. Tom Tancredo of Colorado, former Wisconsin Gov. Tommy Thompson, former New York City Mayor Rudy Giuliani and Sen. John McCain of Arizona.