Republican debates: The undercard

Four Republicans running for President stand on stage before the first of two debates Wednesday, September 16, at the Reagan Presidential Library in Simi Valley, California. From left to right are former New York Gov. George Pataki, former U.S. Sen. Rick Santorum, Louisiana Gov. Bobby Jindal and U.S. Sen. Lindsey Graham.

Republican debates: The undercard

Graham speaks during the first debate, which was held for the lowest-polling candidates at this point in the campaign. "Thanks CNN for having people at this debate," Graham joked -- a reference to Fox News not having an audience for the second-tier debate last month.

Republican debates: The undercard

Pataki makes a point during the debate.

Republican debates: The undercard

Santorum clashed with Graham on immigration early, and he also had a spirited debate with Pataki over Kim Davis, the woman who refused to issue marriage licenses to same-sex couples in Kentucky.

Republican debates: The undercard

Jindal answers a question during the debate. At the beginning, he told moderator Jake Tapper that he didn't violate the so-called "11th Commandment" of not going after your own party in his attacks on Donald Trump. "Let's stop treating Donald Trump like a Republican," Jindal said of the Republican front-runner. "He's not a conservative, he's not a liberal ... he believes in Donald Trump."

Republican debates: The undercard

Pataki stands on stage during preparations for the debate.

Republican debates: The undercard

Santorum enjoys a light-hearted moment before the debate.