The scramble for the late Lindsey Graham’s South Carolina Senate seat just got a new front-runner, and it’s a candidate prediction markets had mostly ignored until President Donald Trump jumped in.
Darline Graham Nordone, Graham’s sister and now the interim senator, moved to the front of the August 11 Republican special primary after Trump’s endorsement over the weekend. Nordone officially joined the race Monday.
Additionally, Rep. Russell Fry and Rep. Ralph Norman have officially joined a field that could still get crowded enough to force an August 25 runoff. Candidates can begin filing for the primary Tuesday.
Nordone was a front-runner for the interim seat until her appointment, but barely registered with traders as a replacement for the next full term come November. Now, with Trump’s backing, it’s a different story.
Nordone gets the bump
For most of the short race, Fry looked like the trader favorite. That changed fast once Trump urged Nordone to run for the full term, giving her a national signal that mattered more than the fact that she had already been appointed to the seat after her brother’s death.
In deep red South Carolina, Trump’s blessing still carries real weight, especially when party alignment rather than ideology defines the race.
The market move was sharp. On Kalshi, with about $1.3 million traded, Nordone is now at 79% to win the special primary, with Fry at 12% and Norman at 11%. Polymarket looks nearly identical, with Nordone at 78%, Fry at 10% and Norman at 11% on roughly $236,000 in volume.
That is a big enough swing to show that traders are not just reacting to the appointment, but that Trump’s backing is a real catalyst.
The field keeps widening
The bigger issue is that the race may not stay this simple. Fry and Norman are now officially in. Attorney Duke Buckner and businessman Mark Lynch are also in the mix. Rep. Nancy Mace and Lt. Gov. Pamela Evette are still possible entrants as well.
That matters because with enough candidates, it could force a runoff between the top two finishers. That is the kind of scenario where a split field can give the front-runner an edge but still leave room for chaos. It has happened in several other 2026 midterm Republican primaries where traders gave Trump endorsees a big backing, only to see it falter in an ensuing runoff.
Markets are acting like Nordone has the lane, but the actual ballot may be messier than the current odds suggest.
Traders still like the GOP
The one thing that hasn’t changed is the broader partisan math in November. Prediction markets still think Republicans are overwhelmingly likely to keep the seat in November, no matter which candidate wins the special primary.
That makes the August 11 contest more about succession and factional control than about whether Democrats can actually flip the state. That’s a different story than several battleground states where the eventual Republican candidate could be a factor in deciding which party ends up controlling the Senate in 2027.
The primary is about which Republican inherits Graham’s mantle, not about who could win in November. Nordone now has the momentum, but South Carolina’s crowded field and runoff rules mean this is still a race that could turn on one more surprise.
