Incumbent Lindsey Graham holds a commanding lead in the South Carolina Republican Senate primary, set for June 9, reflecting his established position within the state party, President Trump’s endorsement, and a substantial fundraising edge over challengers. Recent polling shows Graham well above 50 percent, positioning him to avoid a runoff, while Mark Lynch trails as the most visible opponent amid a fragmented field. Paul Dans suspended his campaign earlier this spring, further consolidating support around the senator. Traders price the outcome at these levels because historical patterns favor well-funded incumbents in low-turnout primaries, though late developments such as unexpected turnout shifts or major candidate missteps could still narrow the margin before ballots are cast.