Sen. Lindsey Graham (R-SC) has a wide lead over his primary rival, Mark Lynch, in the latest South Carolina Senate Republican primary poll, with the incumbent leading among all demographic groups included in the survey.
A new InsiderAdvantage poll of likely Republican primary voters carried out May 13 and 14 show Graham at 56 percent, Lynch at 13 percent, other candidates at 8 percent and 23 percent having no opinion or undecided.
“Graham leads among all demographic groups, something I rarely see in a poll,” said InsiderAdvantage pollster Matt Towery. saying. “In other questions we included in the full survey, more than sixty percent of respondents believed that because of President Trump’s endorsement of Graham, he would win the race. The only task left for Graham is to make sure his voters vote.”
Triumph renovated his support for Graham in April and criticized Lynch in a Truth Social post, writing that Graham was doing a “fantastic job” and that Lynch was a “LUNATIC” who supports Rep. Thomas Massie (R-KY), whom Trump called “perhaps the worst congressman in the history of our country.” Trump also said Lynch “would be a DISASTER for the Republican Party,” while Graham “DOES THE JOB” and urged voters to “VOTE FOR LINDSEY ALL THE WAY.”
Lynch had previously argued in a May 2025 appearance on Breitbart News Saturday that Americans are “tired of Lindsey and the false platform she runs on.” Lynch also said that while “Trump needs some things from Lindsey,” Graham “still resists Trump and fights him at every turn,” adding that “we love President Trump, but that endorsement won’t save him this time.”
A survey from March provided Exclusively for Breitbart News and conducted for the Lynch campaign by Pulse Opinion Research using authoritative Rasmussen Reports methodology, it showed Graham leading Lynch 41 percent to 21 percent in an initial vote, with Paul Dans at 11 percent and 22 percent uncertain. But after respondents were given additional information about the candidates’ backgrounds, Lynch led Graham 34 percent to 23 percent, while Dans held on at 11 percent and 26 percent were unsure.
“I’ve polled quite a few races like this in the ’26 cycle and Lindsey Graham is one of the weakest starters I’ve seen,” Mark Mitchell of Rasmussen Reports said at the time. “Despite the name identification advantage, Mark Lynch takes a clear lead in the informed vote. This is a great opportunity.”
