Mark Sanford Enters South Carolina Senate Race, Becomes Ninth GOP Candidate

Mark Sanford filed for South Carolina's U.S. Senate special election Thursday, becoming the ninth Republican to enter a primary that's already stuffed with bigger Trump allies.

The 66-year-old former governor announced his campaign in a video shot at Coosaw Plantation, his family's farm, according to the Post and Courier. He opened by talking about Lindsey Graham's death and his own father's ALS diagnosis, framing the run as a matter of stewardship and urgency.

"We're at a tipping point," Sanford said in the video, according to both the Post and Courier and NOTUS. "And that's why I've decided to run for the U.S. Senate."

His pitch is the same one he's run on for three decades: the national debt. "We'll add about a trillion dollars to the national debt over the next 100 days, and if left unaddressed, that debt will crush our economy," Sanford said, according to the Washington Examiner.

The trillion-dollar-per-100-days pace tracks with recent Treasury data on federal borrowing. Sanford has been hammering this same math since his 2020 primary challenge against Trump. Whether voters in a solidly Republican state care more about deficits than personality is the actual test of this race.

A Crowded Field, and Sanford's Late Start

Sanford isn't just competing against fellow fiscal conservatives. He's up against U.S. Sen. Darline Graham Nordone, appointed by Gov. Henry McMaster to fill her late brother's seat and already carrying President Trump's endorsement after a White House meeting, according to NOTUS. Press secretary Karoline Leavitt said Trump believes Nordone "will carry on her brother's legacy of public service."

Also running: Reps. Ralph Norman and Russell Fry, both sitting congressmen and Trump loyalists, plus businessman Mark Lynch and several lesser-known Republicans, according to the Post and Courier. The candidate filing period opened July 21 and closes at noon on July 28, leaving little runway before the Aug. 11 primary.

Sanford's late entry follows a public tell. He amended his old House campaign committee's federal filings on July 16 to convert it into a Senate account, the Post and Courier reported. This is a signature move a week before making it official.

This marks Sanford's second campaign of 2026. He briefly ran for his old 1st Congressional District seat earlier this year after Rep. Nancy Mace launched a gubernatorial bid, then dropped out 30 days later, saying his heart wasn't in it, according to the Washington Examiner. Because he pulled out too late to remove his name from the June 9 ballot, Sanford still appeared as a candidate with zero active campaign and still finished fourth in an 11-person field, per the Post and Courier.

The Baggage Nobody's Pretending Isn't There

Sanford's résumé is long. Governor from 2003 to 2011. Two non-consecutive stints representing the 1st Congressional District, from 1995 to 2001 and 2013 to 2019. Trump-backed primary opponent knocked him out of Congress in 2018.

His 2009 disappearance is still the first thing most people remember. As governor, Sanford told staff and reporters he was hiking the Appalachian Trail. He was actually in Argentina with a mistress for five days, according to both NOTUS and the Washington Examiner. His wife Jenny Sanford and their two sons moved out of the governor's mansion soon after, and the divorce played out publicly.

Sanford also reportedly had a relationship in 2020 with Olivia Nuzzi, the former political reporter whose career unraveled after her affairs with Sanford and Robert F. Kennedy Jr. became public, according to NOTUS.

A reasonable Republican primary voter might ask a fair question: does any of that actually matter next to the debt numbers Sanford is running on? South Carolina voters already answered that question once, in 2018, when Trump's endorsement of a primary challenger ended Sanford's House career. His critics argue voters have already rendered a verdict on his electability, not just his personal conduct.

Sanford's 2021 comments to The Guardian, in which he said he found "everything" about Trump and MAGA "objectionable," won't help him with a Republican electorate that has consolidated hard around the president since. His 2020 primary challenge against Trump, run explicitly to force a conversation on debt and deficits, went nowhere.

The Cook Political Report rates the general election as solidly Republican, meaning the real contest plays out in the Aug. 11 primary, according to the Washington Examiner. Whoever wins faces Democratic candidate Dr. Annie Andrews in November.

With filing closing July 28, the field could still grow before the ballot is set. For now, Sanford is betting that fiscal-hawk credibility can outrun both his scandal history and a Trump endorsement working against him. Whether South Carolina Republicans still want to hear the debt argument from the man who delivered it in 2020, or whether Nordone's Graham-family brand and Trump's backing overwhelm the field, gets decided in three weeks.