It's Super Tuesday, and 15 states and territories vote today. MN Sen. Amy Klobuchar dropped out of the race yesterday, and she along with former candidates Pete Buttigieg and Beto O'Rourke endorsed former VP Joe Biden at a Dallas rally.

Former VP Joe Biden won the South Carolina primary, by a wide margin. Businessman Tom Steyer and former South Bend, IN Mayor Pete Buttigieg dropped out, ahead of Super Tuesday. And candidates joined marchers in Selma, AL to commemorate 55 years since police violently stopped voting rights demonstrators from crossing the Edmund Pettus Bridge.

Tonight's the last debate before the South Carolina primaries, but it's also the last before Super Tuesday, which includes California and its 494 delegates.

The Nevada caucuses were Saturday, and Vermont Sen. Bernie Sanders came out ahead by 25 points, and with 42 percent of the nonwhite vote.

Tomorrow are the Nevada caucuses, and Nevada Democrats are hoping for them to run far more smoothly than the ones in Iowa. Candidates battle for that top spot and voting continues.

Six candidates took the debate stage -- former New York Mayor Mike Bloomberg for the first time last night in Las Vegas. He took lots of heat, but so did many of the candidates.

Tonight's the Las Vegas debate, ahead of this weekend's Nevada caucuses. Some candidates are trying to regain the spotlight and others are trying to keep momentum.