Will Mark Sanford be the new republican nominee for Senate in South Carolina?

Kalshi — primary rule

If Mark Sanford is announced to qualify for the runoff in the 2026 South Carolina Senate Republican special primary, then the market resolves to Yes.

Polymarket — resolution criteria

This market will resolve according to the winner of the special Republican Primary for United States Senator from South Carolina, including any potential runoff. If no 2026 special South Carolina Republican Senate Primary takes place by November 2, 2026, 11:59 PM ET, this market will resolve according to the candidate who is the official Republican nominee to contest the November 3, 2026 South Carolina U.S. Senate election. If the results of the special primary are not definitively known, or if there is no Republican nominee to contest the November 3, 2026 South Carolina U.S. Senate election, by November 2, 2026, 11:59 PM ET, this market will resolve to "Other". The resolution source for this market will be the first announcement of the results from the South Carolina Republican party, however an overwhelming consensus of credible reporting may suffice.