Here are a few of the most memorable lines from Donald Trump, Ted Cruz, Marco Rubio and John Kasich. (For the blow-by-blow, check out the CNN live blog
Rubio promising that his proposed Social Security reform wouldn't affect seniors: "I'm against any changes to Social Security that are bad for my mother."
Trump on the Democratic race: "I watched them very intensely, even though it's a very, very boring thing to watch."
Trump on the reserved tone of the night: "So far I cannot believe how civil it's been up here."
Cruz diagnoses Trump's pitch to voters: "He's right about the problems, but his solutions don't work. ... We've got to get beyond rhetoric of China bad and actually get to how do you solve the problem?"
on whether he stands by his comment
, on CNN Wednesday, that he thinks "Islam hates us": "I will stick with exactly what I said to Anderson Cooper."
Rubio on Trump's comments about Muslims: "I know that a lot of people find appeal in the things Donald says, because he says what people wish they could say. The problem is presidents can't just say anything they want, it has consequences -- here and around the world."
Rubio defends his defense of Muslims: "I'm not interested in being politically correct. I'm interest in being correct."
Trump on how he'd take on terrorists, given past suggestions he'd use torture or target their families: "We have to obey the laws, but we have to expand the laws. ... We better expand our laws or we're being a bunch of suckers."
Rubio is not so bullish on the Middle East peace process: "There is no peace deal possible with the Palestinians."
Rubio mocks Trump on the Cuba deal: "I don't know where Cuba is going to sue us, but if it's in a court in Miami, they're going to lose."
Rubio on Climate Change: "One of the reasons why the climate is changing is because the climate has always been changing."
Rubio why he doesn't think legislation intended to slow it would be useful: "America is not a planet, it's a country. ... I am not going to destroy the U.S. economy for a law that will do nothing for our environment."
Kasich disagrees: "You can have a strong environmental policy at the same time that you have strong economic growth."
blames protesters for the rash of violence
at his rallies: "We have some protesters who are bad dudes, they have done some bad things. They are swinging, they are really dangerous. And they get in there and they start hitting people and we had a couple big strong powerful guys doing damage to people. ... If they're going to be taken out, I'd be honest we have to run something."
Kasich perhaps leaving some room for contesting Trump at the convention: "Math doesn't tell the whole story in politics."
Trump says a plurality of delegates should be enough to win the GOP primary: "I think that whoever gets the most delegates should win," then calls the 1,237 majority needed to clinch the nomination a "random number that somebody set."