REUTERS/Rainier Ehrhardt
Voters wait in line at a polling station in Greenville, South Carolina.
With about a quarter of precincts reporting, Donald Trump held a comfortable lead, with over 30% of the vote. Sens. Ted Cruz and Marco Rubio were competing for second with about 21% apiece.
The other three candidates - Jeb Bush, John Kasich, and Ben Carson - didn't appear as if they would break into double digits.
Bush had 8.5%, Kasich had 8.4%, and Carson had 6.1%, with 22% of precincts reporting.
This numbers were particularly disappointing for Bush, who started the race last year as a front-runner and campaigned aggressively in South Carolina. In contrast, Kasich wasn't even in the state on Saturday: He chose to spend the day campaigning in New England.
Bush suspended his campaign later in the night.