Thursday's debate also was an opportunity to score points with voters at home. Takeaway moments include:
Line of the night: "Elect us and your kids will be able to move out because they'll have work." Gingrich, discussing the growth of 20-somethings still living at home.
Invoking Reagan: "I looked at the Reagan diary. You're in it once." Romney to Gingrich, downplaying his contributions to the Reagan revolution.
SNARKiest: "Grandiosity has never been a problem with Newt Gingrich. He does it very, very well." Santorum on Gingrich.
All politics is local: Gingrich scored by referring to S.C.-specific issues, vowing to speed up work modernizing Charleston Harbor and to end the lawsuit against the state over immigration.
Marriage Part I: "It's as close to despicable as anything I can imagine." Gingrich after CNN chose to make the first question about his ex-wife's open marriage allegations.
Marriage Part II: "I'm very proud that my wife of 54 years is with me tonight." Ron Paul after Gingrich was questioned about his marriage issues.
Marriage Part III: "It's an awesome night when you see the tea party and the Republican Party sitting together." U.S. Rep. Tim Scott.