Senator Lindsey Graham (R-SC) is facing growing political pressure as his support among Republican voters shows signs of weakening ahead of a potential primary challenge. A recent Quantus Insights poll of 600 registered South Carolina voters found Graham’s overall approval at just 41 percent, with 46 percent disapproving and 13 percent undecided. Among GOP respondents, 22 percent said they would “definitely” support a primary challenger, and another 23 percent said they would “probably” do so. Only 34 percent expressed definite support for Graham, while 21 percent remained undecided, highlighting vulnerability within his party base.

Businessman Mark Lynch has already entered the race, releasing internal polling that underscores Republican dissatisfaction with Graham. In a hypothetical head-to-head contest, 48 percent supported Graham, 23 percent backed Lynch, and 29 percent were undecided. Lynch has criticized Graham for distancing himself from former President Donald Trump’s agenda, claiming the senator opposed several Trump-supported reforms and backed policies Trump publicly rejected. As discontent grows among conservatives who view Graham as a “RINO” (Republican In Name Only), the primary could become one of the most contested in the 2026 cycle, signaling a possible shift in the political landscape of South Carolina’s Republican electorate.