Donald Trump

Former President George W. Bush hit the campaign trail for his brother in South Carolina Monday. He brought some self-deprecating humor and defended his record as president during and after 9/11.

The sudden death of Supreme Court Justice Antonin Scalia spurs debate over whether President Obama should fill the vacancy and what type of justice each candidate would nominate if elected.

On the GOP side, the state has a mix of evangelicals and moderates that could test the field. For Democrats, Clinton and Sanders are fighting for black voters, who are more than half the electorate.

In the spin room, reporters clamor for quotes and candidates weave their positive narratives. It's a quite a sight, sure — but in the age of social media, has it become irrelevant?

People have been sticking it to The Man for years. And in this year's presidential race, The Man is really, really easy to stick it to.

Fourth place.

Hillary Clinton's big problems: She's not winning women, and voters still don't trust her. Meanwhile, Donald Trump's support is broad and deep.

Did Rubio do serious damage during Saturday's debate? Does Trump need a better ground game? Will Sanders ride a huge win into other states? And how many more Republicans will leave the race?

Under the state's delegate process, candidates who don't get at least 10 percent of the vote lose their delegates to the winner of the primary.