GOP Presidential Candidate Herman Cain admits he misspoke about what he would do with terrorist detainees at Gitmo.  His message at last night's CNN GOP Presidential Debate was a lot different than what he said earlier in the day.  Anderson grilled Cain about that and more after the debate.

AC360° is live after the debate! The political panel will cover the best moments, personal attacks made by the candidates and the state of the GOP race now. What did you think of the heated debate? Share your thoughts in a comment below!

View exclusive behind-the-scenes photos from the debate.

During the CNN Republican Presidential Debate, Rick Santorum and Mitt Romney had an intense argument over Romney's health care plan in Massachusetts.

Gov. Rick Perry and Mitt Romney get in a heated exchange over illegal immigration during the GOP debate in Las Vegas, and Perry makes it personal.

AC360° producer Ben Finley gives a tour of the CNN set prior to the Western Republican Debate in Las Vegas. Tune in at 8 p.m. ET when the candidates take the stage with Anderson Cooper moderating the discussion.

Editor's note: David Gergen is a senior political analyst for CNN and has been an adviser to four presidents. He is a professor of public service and director of the Center for Public Leadership at Harvard University's Kennedy School of Government. Follow him on Twitter: @David_Gergen. Michael Zuckerman is David Gergen's research assistant. Watch the GOP debate Tuesday night at 8 ET on CNN.

(CNN) - As GOP presidential candidates gather in Las Vegas Tuesday night for another key debate, pressure is mounting on them to address spreading public protests against Wall Street. How they answer could shape the political landscape from here to the November elections.

Republicans haven't had to pay much attention to Occupy Wall Street till now - they could afford to sniff that the crowds in Zuccotti Park looked more like Woodstock than Wall Street. But as demonstrations have sprung up across the U.S. and Europe, reverberating through social media and gaining more serious attention from mainstream media, politicians must pay more attention.

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Editor's note: Todd Graham is the director of debate at Southern Illinois University, Carbondale. He has coached his teams to national championships and has been honored with the Ross K. Smith national debate coach of the year award. Graham has analyzed presidential debates for five elections.

Tune in for the CNN Republican Debate at 8 p.m. ET.

(CNN) - Well, Todd, who won? I hear that question a lot after presidential debates. And with the sheer number of debates in the campaign for the Republican nomination, it may get to the point where everyone feels qualified to give an opinion as a debate expert.

But as an actual debate expert, I can tell you there is something of an art to determining who won, who blew it and who's still alive. Here's what you should watch for if you're keeping score at home:

Argument depth. Get beneath the surface. Seriously, I love the 9-9-9 plan. It's catchy, it rhymes and Herman Cain says it with such pleasure that it's hard not to like the idea. I've even instituted my own 9-9-9 plans wherever I can - into my dinner recipes, into my golf game, and even into my workouts. But then a friend asked me how Cain's 9-9-9 plan would raise the same amount of revenue that our government currently brings in without increasing the burden on either the middle class or the poor. And I couldn't answer the question. I was so mesmerized by the catch phrase of the day that I failed to note that Cain had not gone into depth about his plan. You can do better with one simple test: Did the candidate talk in glittering generalities about their ideas, or did he or she provide specifics?

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Time-lapse video shows the construction of the set for the CNN Republican debate in Las Vegas. Watch Anderson Cooper moderate at 8 p.m. ET tonight.

Herman Cain is the former CEO of Godfather's Pizza, so it's understandable that he loves a fresh pie. It's the jokes, songs and pizza puns that have landed on Anderson Cooper's RidicuList.