South Carolina Senate Runoff 2026: Darline Graham vs. Ralph Norman and the Fight for Lindsey Graham's Seat
South Carolina Senate runoff Aug. 25: Trump-backed Darline Graham vs. Ralph Norman. The winner meets Democrat Annie Andrews on Nov. 3. Markets favor Graham.
Thirteen days from now, South Carolina Republicans will answer a question that cuts to the heart of how the party chooses its standard-bearers: does a presidential endorsement outweigh a decade of conservative legislative work?
On August 25, appointed Sen. Darline Graham — sister of the late Lindsey Graham, backed by President Trump, and a first-time candidate who has never held elected office — faces Rep. Ralph Norman in a Republican primary runoff for South Carolina's U.S. Senate seat. The winner faces Democrat Dr. Annie Andrews on November 3.
Prediction markets currently price Graham as the clear frontrunner heading into the runoff. What does the geography show, what does each candidate need, and what comes next?
How We Got Here: A Month-Long Sprint
Lindsey Graham died suddenly at 71 on July 11, 2026, upending one of the year's most predictable Senate races. South Carolina law triggered an accelerated special-election timeline: candidates began filing before his funeral services had concluded in Washington and Columbia, according to the Associated Press. The state set August 11 as the date for a special Republican primary, with a runoff required if no candidate cleared 50 percent of the vote.
Ten Republicans entered. Lindsey Graham's sister, Darline Graham — appointed by Gov. Henry McMaster to serve the remainder of her brother's term — joined the field as the most recognizable name and the only candidate with a presidential endorsement. She had no prior record of holding elected office.
The Primary Results: What August 11 Revealed
With more than 95 percent of the vote counted, Graham led the 10-candidate field with 32.7 percent (109,592 votes). Rep. Ralph Norman finished second at 24.6 percent (82,523 votes), edging out Rep. Russell Fry at 19.6 percent (65,732 votes). Former Gov. Mark Sanford placed fourth at 14.9 percent (50,001 votes). Businessman Mark Lynch — who ran against Lindsey Graham in the regular Republican primary earlier this year — placed fifth at 5.9 percent (19,857 votes).
Neither finalist got a majority, so a runoff was triggered under South Carolina law. August 25 is the date.
The Geography That Defined the Night
The geographic split was stark — and it matters enormously for the runoff.
Graham dominated the Lowcountry, the Midlands, and coastal communities. She won Beaufort County by 26 points, Lexington by 20, Aiken by 20, Richland by 17, Berkeley by 14, Dorchester by 15, and swept coastal and rural Lowcountry counties by similar or wider margins, according to results compiled by the New York Times.
Norman ran the table in the Upstate and along the North Carolina border. He won Greenville County — the state's most populous county — by 17 points, Spartanburg by 14, York by 22, and Anderson, Cherokee, Pickens, Laurens, and Union counties by margins ranging from 3 to 21 points.
Rep. Russell Fry's strength was concentrated in his own congressional district — the Grand Strand corridor centered on Horry County, where he won by nearly 7 points. Without a third candidate splitting the Upstate vote in a head-to-head runoff, Norman's base becomes considerably stronger on the map.
The Candidates
Darline Graham, 62: Trump's Pick and South Carolina's First Female Senator
Darline Graham is South Carolina's first woman ever to serve in the United States Senate — a historic marker her campaign has prominently featured. Appointed by Governor McMaster weeks after her brother's death, she entered the Senate as the most recognizable name in the field and the only candidate with an endorsement from President Trump, who eulogized Lindsey Graham at Washington National Cathedral before backing his sister's Senate run.
Graham has aligned her campaign tightly with Trump and the Republican mainstream. She has offered limited policy specifics on intraparty flashpoints. Norman has already signaled he intends to press her on where she stands on abortion, the death penalty, and federal spending in the runoff — and Graham said Tuesday evening she would be willing to debate him, according to The State newspaper.
Graham's absence of a prior political record cuts both ways. It means voters have little to hold against her — but it also means the race has largely been a referendum on name recognition and Trump's endorsement rather than a head-to-head on legislative philosophy.
Ralph Norman, 73: The Freedom Caucus Veteran Without the Endorsement
Norman has represented South Carolina's 5th Congressional District — the Charlotte suburbs and the Upstate — since 2017, winning a special election after Mick Mulvaney vacated the seat. He is vice chairman of the House Freedom Caucus, the chamber's most conservative organized bloc, with a 98 percent lifetime conservative voting record according to the Senate Conservatives Fund, which has endorsed him. Senators Rick Scott of Florida and Mike Lee of Utah have also backed Norman.
His argument is straightforward: experience and a documented record voters do not have to guess at. "My record is an open book," Norman told supporters Tuesday night, according to The State. "You know what I've done, and I will continue that."
Norman is not without complications in this race. He placed third — not second — in June's crowded Republican gubernatorial primary, behind Lt. Gov. Pamela Evette and Attorney General Alan Wilson. And he backed Nikki Haley, not Trump, in the 2024 presidential primary — a divergence that almost certainly contributed to the president's decision to endorse Graham rather than the congressman. Norman acknowledged Tuesday he wanted the Trump endorsement but did not receive it: "It's fine because it is South Carolina choosing the next senator."
His campaign has been operating on a leaner budget than his gubernatorial run. Norman spent more than $5 million of his own money on the governor's race; through the Senate primary he had invested $400,000 into the Senate bid, according to Roll Call.
What the Market Is Saying
Prediction markets are pricing a Graham win in the Republican runoff. Cross-platform consensus from Kalshi and Polymarket — aggregated across more than $9.94 million in traded volume — has Graham at 76 percent and Norman at 22 percent heading into August 25.
The November general election market for South Carolina's Senate seat:
The gap reflects Graham's structural advantages heading into the runoff: an 8-percentage-point raw margin from round one, Trump's active support with a promised campaign appearance, and a geographic coalition anchored in the higher-population counties. Norman's Upstate base is real and cohesive, but he needs significant vote transfers from the Fry and Sanford blocs to close that gap.
The Runoff Math: What Each Side Needs
Norman's path requires consolidating the overwhelming majority of the 65,732 votes Fry won and the 50,001 Sanford carried. Combined with his own 82,523 and Lynch's 19,857 — Lynch announced after the primary he is backing Norman — that arithmetic could theoretically approach parity. But three forces complicate the projection: runoffs almost always draw fewer voters than contested 10-candidate primaries; Fry's voters are concentrated in the Grand Strand, not the Upstate counties Norman dominates; and Sanford's voters have a profile — institutionalist, occasionally anti-Trump — that may not flow uniformly to either runoff candidate.
Norman's best tool for the next two weeks is a debate, which Graham has agreed to. A direct head-to-head in a low-turnout environment, where Norman can press Graham on specific policy commitments and contrast their resumes, is precisely the format that favors a candidate running on experience over name recognition.
Graham's path is less about addition and more about protection and mobilization. She needs to hold her Lowcountry and Midlands coalition, minimize defections among Fry voters in coastal counties adjacent to her areas of strength, and turn out voters who may be inclined to sit out a lower-profile runoff. Trump's promised presence on the trail could be decisive for that mobilization challenge: runoff electorates skew toward the most engaged partisans, and a presidential visit activates exactly those voters.
The single biggest variable for Graham is not Norman's argument — it is turnout. A smaller electorate favoring the most committed voters could favor the candidate with the most ideologically motivated base, which is not obviously Graham's.
The General Election Waiting Room: Dr. Annie Andrews
While Republicans resolve their nomination, Democrat Dr. Annie Andrews has been building a general election campaign since June 9, when she won the Democratic primary with 61.5 percent of the vote against Brandon Brown and Kyle Freeman.
Andrews, 45, is a Charleston pediatrician who previously ran for Congress in South Carolina's 1st District in 2022 — losing to Rep. Nancy Mace by nearly 14 points. Her Senate campaign has raised $10.8 million through June 30, with $4.1 million in cash on hand according to Federal Election Commission filings — a substantial war chest for a candidate in a state rated heavily Republican.
Her team includes veterans of Jaime Harrison's 2020 Senate campaign against Lindsey Graham — which raised a record $130 million and still lost by 10 points. Andrews's campaign focuses on healthcare access, Medicaid funding, abortion rights, and opposition to vaccine skepticism in federal health leadership.
Major forecasters rate the general election as Solid Republican (Cook Political Report) or Safe Republican (Sabato's Crystal Ball), with Decision Desk HQ and FiftyPlusOne at Likely Republican. Andrews and her allies point to the open-seat dynamic Lindsey Graham's death created — arguing the structural playing field has shifted from running against a four-term incumbent. No independent general-election public poll has been released with either Graham or Norman as the Republican nominee.
No Democrat has won a U.S. Senate seat in South Carolina since 1998. Lindsey Graham defeated his most generously funded Democratic opponent in 2020 — Harrison — by 10 points. The state's structural lean means the winner of the August 25 runoff enters November as a significant favorite regardless of the general-election forecaster spread.
What the Runoff Signals Beyond South Carolina
South Carolina is not a race that will determine Senate control — every major forecaster rates it as a safe or solid Republican hold in November. But the August 25 runoff carries interpretive weight for a broader 2026 question: how decisive is a Trump endorsement in a Republican primary when the challenger is an experienced, credentialed conservative with institutional backing?
If Norman were to win over Trump's active opposition, it would add a notable data point to a growing 2026 pattern in which endorsed candidates have faced stiffer competition than recent cycles suggested. If Graham wins decisively, it reinforces the endorsement's continued potency even in compressed, low-turnout runoff environments.
For Democrats watching nationally, the outcome shapes their November assignment: Andrews faces a different strategic challenge running against a first-time candidate with a famous name than against a nine-year House incumbent with a defined conservative record.
The clock is running. Thirteen days to August 25. Then 70 days to November 3.
Sources: Associated Press via PBS NewsHour; NBC News; The New York Times; Roll Call; The State (Columbia, S.C.); SC Daily Gazette; CNN; Washington Post; Politico; Federal Election Commission campaign finance records; Cook Political Report.
Market odds from electionpredictions.us cross-platform consensus (Kalshi + Polymarket), volume $9,944,531, as of August 12, 2026. Prediction market prices reflect collective trader assessment, not a guaranteed outcome.
Frequently Asked Questions
When is the South Carolina Senate runoff? The Republican special primary runoff is Tuesday, August 25, 2026. Polls open at 7 a.m. and close at 7 p.m. local time.
Who is in the South Carolina Senate runoff? Appointed Sen. Darline Graham and Rep. Ralph Norman. Both are Republicans. Graham led the August 11 primary with 32.7 percent; Norman finished second with 24.6 percent. Neither cleared the 50 percent threshold required to avoid a runoff under South Carolina law.
Who is the Democratic candidate for South Carolina Senate in 2026? Dr. Annie Andrews, a 45-year-old Charleston pediatrician. She won the Democratic primary on June 9, 2026, with 61.5 percent of the vote.
When is the South Carolina Senate general election? November 3, 2026. The winner of the August 25 Republican runoff will face Democrat Annie Andrews.
What do forecasters say about the South Carolina Senate general election? Cook Political Report rates the race Solid Republican. Sabato's Crystal Ball rates it Safe Republican. Decision Desk HQ rates it Likely Republican. The Economist rates it Lean Republican. No forecaster has rated it as competitive for Democrats as of August 12, 2026.
Has South Carolina ever elected a Democratic senator recently? No Democrat has won a U.S. Senate seat in South Carolina since 1998. Lindsey Graham won his most recent Senate election in 2020 by 10 percentage points over Jaime Harrison, who raised a record $130 million.