Trump is projected to win tonight, and, as expected, his edge is showing up as we get actual returns from around South Carolina. With 24 percent of the expected vote reporting, he leads Haley by 15 points, 57 percent to 42 percent. We have nearly all the vote in from three counties, but only one especially sizable one: Berkeley County, which sits next door to Charleston. There, Trump leads by 17 points, 58 percent to 41 percent. In trying to gauge just how strong that is for Trump relative to 2016, it's a tad bit worse than the combined 62 percent vote share that Trump, Ted Cruz and Ben Carson collected in the county back then. Still, it points to the all-but-certain outcome of a Trump victory tonight.

—Geoffrey Skelley, 538

Haley still hasn’t come out to address supporters yet. This is probably reading too much into it, but the longer she waits, the more I wonder if she is going to drop out. After New Hampshire, she spoke almost immediately.

—Nathaniel Rakich, 538

That's true, Nathaniel. But maybe Haley is hoping that actively campaigning, and still having a campaign apparatus running, will give her an advantage over the other also-rans.

—Monica Potts, 538

Remember that the primary is ultimately all about the delegates candidates win to vote for them at the RNC in July. In the delegate math tonight, Trump is coming out way ahead. South Carolina awards delegates in two sets: 29 are awarded to the winner of the statewide popular vote (which are all going to Trump tonight) and the remaining 21 are split equally between the remaining 7 congressional districts. According to ABC's delegate projections Trump has already won 38 delegates tonight, with 12 left to assign in 4 more districts. But if Trump is heading for a 30-point margin statewide, it's unlikely Haley will win any of those that remain.

Our delegate benchmarks model had Haley needing all 50 tonight to be on track for the GOP nomination. It is her home state, after all.

—G. Elliott Morris, 538

If you're not quite as election-obsessed as us here at 538, please allow me (a person who willfully chose to spend an evening three weeks into her maternity leave watching the GOP debate) to fill you in on the last few weeks.

At the start of the year, there were still six major candidates competing for the Republican Party nomination. By the end of January, only two remained. In Iowa, Trump came out on top with 51 percent of the vote, followed by DeSantis and Haley. Ramaswamy and Hutchinson both dropped out after the Iowa caucuses (Christie dropped out just before), while DeSantis ended his campaign just before the New Hampshire primary, where Trump defeated Haley 54 percent to 43 percent.

So far, though, Haley has refused to throw in the towel, despite trailing Trump badly in polls.

She also did poorly in two additional contests in early February. In Nevada, where Trump wasn't even on the primary ballot (he was on the ballot for the Nevada GOP caucus … it was a whole thing), she still got only 31 percent, with voters preferring the electoral equivalent of "none of the above." And she lagged behind Trump in the Virgin Islands GOP caucuses, too.

I'll have more in a bit about why Haley might still be running, but suffice to say it's an uphill battle against the former president.

—Kaleigh Rogers, 538