In the week following South Carolina's June 9 Republican gubernatorial primary, prediction markets have significantly repriced the upcoming runoff, with odds shifting sharply in favor of Attorney General Alan Wilson. The move appears driven by a post-primary consolidation of support from former rivals, which traders are weighing more heavily than Lieutenant Governor Pamela Evette's first-place finish and a key endorsement from former President Donald Trump.
Contracts on the Kalshi exchange for Alan Wilson to win the GOP nomination jumped 12 percentage points in the session ending June 15, 2026, rising to 70% from a prior 58%. In the two-candidate market, probability shifted directly from Evette, whose chances fell 8 percentage points to 28%. This repricing suggests traders believe the combined vote of the defeated primary candidates—who collectively won over 55% of the vote—will break decisively for Wilson in the one-on-one contest on June 23.
Distribution Analysis
| Outcome | Current Prob | Change | Volume |
|---|---|---|---|
| Alan Wilson | 70% | +12.0pp | 22,600 |
| Pamela Evette | 28% | -8.0pp | 44,371 |
Net: Probability shifted decisively toward an Alan Wilson nomination, with his contract gaining 12 percentage points while his opponent's declined by 8 points on significant trading volume.
What's Driving the Shift
The sharp repricing in favor of Wilson reflects the market's focus on the unique dynamics of a runoff election, where voter coalitions are reshuffled.
Consolidation of Former Rivals: A critical factor appears to be the endorsements from defeated primary opponents. U.S. Rep. Nancy Mace, who finished fifth with 12.1% of the vote, immediately endorsed Wilson on primary night, calling him a "law and order governor." The market move indicates a belief that supporters of Mace and other candidates are more likely to align with Wilson than with the Trump-endorsed Evette.
Primary Vote Ceiling: While Evette finished first in the June 9 primary, she did so with just 28.9% of the vote. This left a vast majority of Republican primary voters—over 70%—who cast a ballot for another candidate. Traders appear to believe this creates a large, accessible pool of voters for Wilson, who finished a close second with 26.2%.
Runoff Campaign Framing: Post-primary messaging is also playing a role. Evette's campaign continues to lean heavily on her endorsement from Donald Trump, which she credited as "rocket fuel" for her first-place finish. Meanwhile, Wilson's campaign has reportedly begun to draw sharp contrasts, framing the race as a choice against a "finger in the wind politician." The market's shift suggests this strategy of coalescing the non-Evette vote is seen as more potent in a head-to-head matchup.
Market Context
The current market pricing of 70% for a Wilson nomination stands in stark contrast to the initial primary results, where he trailed Evette. This divergence highlights that traders are not simply extrapolating from the June 9 totals but are actively forecasting the outcome of a lower-turnout, more intense runoff election.
The significant volume on the declining Evette contract (44,371 shares traded) compared to the rising Wilson contract (22,600 shares) suggests strong conviction among traders selling Evette's chances of holding her primary-night lead. In South Carolina, a candidate must secure more than 50% of the vote to avoid a runoff, a threshold neither candidate came close to reaching.
What to Watch
The primary catalyst for this market will be the runoff election itself on June 23, 2026. Before then, a televised debate scheduled for June 16 could provide the next major test for both candidates and potentially trigger further repricing. Both campaigns are also actively seeking the endorsement of third-place finisher U.S. Rep. Ralph Norman, whose support could be crucial in the final days of the race. The eventual Republican nominee will face Democratic nominee Jermaine Johnson in the November 3 general election.
