Here’s what to know:Who is running in the South Carolina Republican primary? South Carolina’s primaries are open, which means any registered voter can take part in either the Republican primary or the Democratic primary, but not both. When Trump won the South Carolina primary with more than 32% of the vote in 2016, just about 1% of the GOP primary voters were Black. Only once since 1980 have South Carolina Republican primary voters not supported the ultimate nominee. The only recent election in which South Carolina did not pick the ultimate Democratic nominee was in 2004, when then-Sen. John Edwards, who was born in South Carolina and represented North Carolina in the Senate, beat then-Massachusetts Sen. John Kerry.

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