The polls open in South Carolina on Saturday in the first of two defining primaries. For a generation, South Carolina was the place where the Republican Party shook off the confetti of Iowa and New Hampshire and anointed its front-runner -- Ronald Reagan, George H.W. Bush, Bob Dole, George W. Bush, John McCain. And then came 2012, when Newt Gingrich surged from behind to take almost every county in a landslide over Mitt Romney. This year, the other 49 states have had to adjust to the new reality of political insurgents breaking the rules. South Carolina had a head start.

In this video, you'll get a tour of the state and find out what Republicans -- and next week, Democrats -- need to capture if they're going to win. You'll hear from dancing liberals, very worried moderates, members of Congress who find themselves torn in several directions at once, and conservatives who've got this thing decided already. And as usual, you'll learn what to watch on election night, allowing you to scoff at the talking heads who have to come up with narratives when 1 percent of the vote is in.