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

Am I the only one who uses the term "bet your bippy"??

—Nathaniel Rakich, 538

Right, so why is Haley sticking around if Trump is the presumptive nominee? We've put together a few hypotheses — spite, in case something happens, sticking it to the man etc — but, as ever with politicians, we cannot discount the possibility that she's in it for her. I keep thinking of Beto O'Rourke's "born to run" comments in the 2020 primary. A lot of politicians think this way!

—G. Elliott Morris, 538

We don't have final results by congressional district (much less overall), but as we can see from a map of the results, Haley is doing better along the coast near Charleston than in much of the rest of South Carolina. That may signal that Haley could carry the 1st Congressional District once all is said and done to win three delegates. That may not seem like much, but Trump swept South Carolina's delegates in 2016, and if Haley is sticking around, winning any delegates has to be part of her strategy to carry on.

Half of the 1st District's population is in Charleston and Beaufort counties, according to Daily Kos Elections — both of which Haley currently lead in. Another 49 percent of the district lies in Berkeley and Dorchester counties, both of which Trump holds an edge in (the remaining 1 percent is in Colleton and Jasper counties). Charleston and Dorchester are both split between the 1st and 6th, so we can't figure out the district-level result based purely on the county-level numbers. So we'll have to see. But Haley's showing in the 1st might be her one bright spot tonight.

—Geoffrey Skelley, 538