After picking Denver last week, he picked Carolina during the debate.
Rubio pledges to make "the issue of life" a major general-election topic.
Rubio said Christian groups "in fact, are being discriminated against."
"In the Middle East, we have people chopping the heads off Christians," he says.
He hit Obama over ObamaCare, gun rights and "gutting" the military
Cruz is blaming CNN for a rumor that Carson was quitting after Iowa.
For the first time, Trump was not the most talked about candidate during a debate.
Trump accused the Republican National Committee of stacking the crowd with Jeb Bush backers.
He said he didn't want to pursue a bill he knew wouldn't pass.
Trump brushed off Bush, saying he was trying to be a "tough guy."