Sen. Darline Graham, who is serving out the remainder of her brother's term, faces a crowded field of candidates to replace him on the ballot as the Republican nominee for U.S. Senate in November.

The multi-candidate South Carolina senate race is expected to head to a runoff, which would take place on Aug. 25.

On Tuesday, voters in South Carolina will choose a Republican nominee for the Senate to replace the late Sen. Lindsey Graham.

Voters head to the polls on Aug. 11.