Voters Cast Ballots in South Carolina Primary Election

A voter casts a ballot in the South Carolina primary election, Feb. 29, 2020, in Columbia, S.C.

Voters cast their ballots in the South Carolina primary election, Feb. 29, 2020, in Columbia, S.C.

A vote here sign is seen outside a polling place during the South Carolina primary, Feb. 29, 2020, in Columbia, S.C.

Voters cast their ballots in the South Carolina primary election, Feb. 29, 2020, in Columbia, S.C.

Polling manager Diana Belton shows a roll of voting stickers as people arrive to vote in the Democratic presidential primary in Hopkins, S.C., Feb. 29, 2020.

Marie McMahon, left, signs in to vote at a primary polling place, Feb. 29, 2020, in Charleston, S.C.

A voter departs a polling place, Feb. 29, 2020, in Charleston, S.C., after voting in the state's primary.

Democratic presidential candidate former Vice President Joe Biden speaks during a campaign event, Feb. 28, 2020, in Spartanburg, S.C.

President Donald Trump shakes hands with Sen. Lindsey Graham, R-S.C., next to Sen. Tim Scott, R-S.C., as Trump arrives at a campaign rally in North Charleston, S.C., Feb. 28, 2020.

Democrat Tom Steyer addresses the crowd at his election-eve rally the night before the South Carolina presidential primary on Feb. 28, 2020, in Columbia, S.C.

Democratic presidential candidate Sen. Elizabeth Warren, D-Mass., waves to supporters and volunteers, Feb. 29, 2020, in Columbia, S.C.

Attendees cheer during a Democratic presidential candidate Sen. Bernie Sanders, I-Vt., a campaign event, Feb. 28, 2020, in Columbia, S.C.

Democratic presidential candidate Sen. Bernie Sanders, I-Vt., speaks during a campaign event, Feb. 28, 2020, in Columbia, S.C.

Democratic presidential candidate former South Bend Mayor Pete Buttigieg greets supporters after speaking at a campaign event in Sumter, S.C., Feb. 28, 2020.