Jenny Costa Honeycutt and Mark Smith advanced from the June 9, 2026, Republican primary for South Carolina’s 1st Congressional District after finishing first and second in a crowded field, with Honeycutt at 22.1 percent and Smith at 18 percent; Sam McCown placed third at 15.7 percent and was eliminated along with the remaining candidates. The June 23 runoff now determines the nominee in the solidly Republican district vacated by Nancy Mace. Trader pricing reflects Smith’s edge in the head-to-head contest, driven by his state legislative record, local government experience, and campaign infrastructure, while Honeycutt’s lead in the initial round stemmed from her Charleston County Council tenure and emphasis on affordability and fiscal issues. A scheduled June 17 runoff debate and any late endorsements or turnout patterns in coastal Lowcountry precincts remain the key variables that could shift the current consensus.