The South Carolina runoff pits an appointed senator with major endorsements against a congressman with a strong Upstate base. With no verified final polling or odds in the available research, the Aug. 11 primary results and Tuesday turnout offer the more useful guide.
Darline Graham is facing Ralph Norman in a South Carolina election matchup for the Republican U.S. Senate nomination, with the final odds and polls about their race drawing attention ahead of Tuesday’s runoff. As of August 24, 2026, the available research does not document a verified final public poll or betting line, so Graham’s chances of losing to Norman are best assessed through the Aug. 11 primary result, turnout and each candidate’s regional support.
Graham led Norman by roughly 33% to 25% in the first round but did not clear the majority required to win outright. That gives her a real edge, not a guarantee: a two-candidate runoff changes the math, particularly when Norman’s strongest territory includes some of South Carolina’s biggest Republican-voting counties.
The first-round lead sets the baseline
According to the Associated Press, Graham finished first in the August 11 special Republican primary, receiving about one-third of the vote. Norman, a five-term U.S. representative, finished second with about one-quarter, while U.S. Rep. Russell Fry received about 20%.
The immediate case for Graham is straightforward. She began the runoff as the first-place finisher, and Fry endorsed her after his loss. Graham also has the backing of Republican Sen. Tim Scott and President Donald Trump, who appeared with her at a Myrtle Beach rally shortly before the runoff.
But a first-round plurality is not the same as a runoff majority. The central question is where Fry’s voters go, how many return to vote, and whether the electorate that turns out for a quick second election looks like the electorate that voted on August 11.
Why no final number settles it
The available materials include a headline referring to final odds and polls, but they do not provide a final survey’s methodology, field dates, sample size, margin of error or candidate support levels. They also do not provide a named betting market or a closing price.
That distinction matters. A poll is a time-limited measurement of voter sentiment, shaped by who was contacted and when. Betting markets reflect the judgments and incentives of participants; they can react quickly to news and endorsements, but they are not votes and are not a substitute for verified election results.
Without those underlying details, assigning Graham or Norman a precise probability would create more certainty than the evidence supports. The defensible read is narrower: Graham entered with a measurable first-round advantage, while Norman retained a plausible route through geography, turnout and consolidation of anti-Graham voters.
Norman’s map offers a path
AP’s election preview identified Norman’s best performance in the Piedmont and Upstate, including the Greenville area. Greenville County is South Carolina’s most populous county and typically one of the state’s most consequential places in Republican primaries.
That gives Norman a reason to focus less on matching Graham everywhere than on increasing participation where he already has a base. Greenville had also shown a willingness to reject statewide front-runners in prior Republican contests, AP noted. Norman carried the county in the earlier gubernatorial primary.
Graham’s support was broader in other parts of the state. She swept counties across central South Carolina, including the Columbia area, and the Lowcountry, which includes Charleston. Her strongest shares came in counties along the Georgia border.
The runoff therefore tests two different electoral theories: Graham’s wider statewide coalition against Norman’s chance to run up margins in Republican-rich Upstate areas. A county map can clarify those strengths, but it cannot reveal whether supporters will participate again until ballots are cast.
Turnout could change the margin
South Carolina Republicans had already been asked to vote repeatedly in 2026. The AP reported that this runoff would be the fourth trip to the polls since June for many voters, after the original June 9 Republican primary and the August 11 special primary.
About 336,000 voters participated in the August 11 special primary, compared with roughly 465,000 in the June Republican Senate primary. Those totals point to the challenge both campaigns face: runoff elections often depend less on broad public awareness than on whether reliable supporters return on a compressed timetable.
As of the Friday before the election, about 45,000 ballots had already been cast, AP reported. In the August 11 contest, around 19% of votes were cast early in person or by mail. Nearly all of the state’s 46 counties typically release most early and absentee results in their first election-night update.
Early returns will not establish a winner by themselves, but they may offer the first clue about whether participation is concentrated in Graham-friendly or Norman-friendly regions. Election-night observers will be watching the Upstate, the Columbia area, the Lowcountry and other large counties such as Horry, Lexington and Spartanburg.
What happens after Tuesday
Polls close at 7 p.m. Eastern time. The Associated Press says it declares a winner only once the trailing candidate has no remaining path to overcome the margin; it does not make projections.
A margin of 1% of the total vote or less triggers an automatic recount under South Carolina law. That means a close initial result may not be the final administrative word, even if one candidate leads on election night.
The runoff winner advances to face Democratic nominee Annie Andrews, a Charleston pediatrician, in the general election. The stakes are unusual because the race follows the death of Sen. Lindsey Graham, whose vacancy created both a contest for the remainder of his current term and a new Republican nominee for the next six-year term.
The clearest read before votes arrive
Graham’s 33% to 25% first-round advantage, Fry’s endorsement and high-profile Republican support make her the candidate with the stronger documented starting position. Norman’s Upstate strength, especially around Greenville, gives him a credible counterweight in a runoff where a smaller and differently composed electorate can matter more than statewide name recognition.
For now, the useful conclusion is not a manufactured percentage chance. It is that the available verified data shows an advantage for Graham, while the missing final polling and odds leave the decisive variables where they belong: turnout, regional margins and the redistribution of voters whose first choice is no longer on the ballot.
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