Republican presidential hopefuls, from left, Rep. Tom Tancredo, R-Colo.; Rep. Ron Paul, R-Texas; former Arkansas Gov. Mike Huckabee; former New York City Mayor Rudy Giuliani; former Massachusetts Gov. Mitt Romney; Sen. John McCain, R-Ariz.; Sen. Sam Brownback, R-Kan.; and Rep. Duncan Hunter, R-Calif.,... (Associated Press)