Assistant House Minority Leader James E. Clyburn, D-S.C., will join Elizabeth Colbert Busch, the favorite to win the Democratic nomination in South Carolina’s 1st District special election, in Charleston on Saturday.

The 11-term congressman “will be making an important announcement” alongside Colbert Busch, according to a press release from the campaign.

Clyburn will likely endorse Colbert Busch, the sister of comedian Stephen Colbert. Clyburn would be endorsing her over Ben Frasier, a perennial candidate, who is black. The primary will be held March 19.

His backing comes on the heels of endorsements from the AFL-CIO labor union and Charleston Mayor Joe Riley. Wealthy businessman Martin Skelly also dropped out of the special election this week and endorsed Colbert Busch.

The candidate’s comedian brother will be helping her out later this month as well by hosting fundraisers on two straight days in New York City and Charleston.

Asked how many times he had run for Congress before, Frasier did not know but estimated “about nine or 10 times.”

“And I’m ready for nine or 10 more,” he told CQ Roll Call in a short telephone interview.

The GOP-friendly district includes almost all of the South Carolina coast. The seat is open following Republican Tim Scott’s appointment to the Senate.

There are 16 Republicans running in the GOP primary. If no candidate tops 50 percent, which is likely, a runoff will be held April 2.