Does James Fishback Stand a Chance in Latest Florida Republican Governor Nominee Odds for Tuesday's Primary?
Florida Republicans vote Tuesday, August 18, to choose their nominee for governor, with prediction markets showing an enormous gap between Byron Donalds and James Fishback as voting concludes. Donalds enters primary day as the overwhelming market favorite, while Fishback's probability has collapsed after briefly attracting more attention earlier this year.
Peter Alexis - August 18, 2026, 6:55 PM EDT
4 Minute ReadFlorida Governor Odds: Byron Donalds Extends to Massive Favorite Ahead of Florida Republican Governor Primary on Tuesday Night
The Florida Republican gubernatorial primary has become one of the most one-sided major prediction markets of the 2026 cycle. Donalds is up to 98.9% on Kalshi, while Fishback has fallen to just 0.8%, with more than $73 million traded on the market.
Fishback's trajectory tells much of the story. His probability briefly climbed to roughly 12% in March, but it has steadily collapsed as Donalds consolidated support and entered primary day as the candidate widely expected by outside political reporting to win the nomination. A recent August poll had Donalds leading the Republican field by 31 points while Fishback registered just 4%.
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Latest Florida Governor Nominee Odds From Kalshi
Candidate | Implied Probability |
|---|---|
Byron Donalds | 98.9% |
James Fishback | 0.8% |
Byron Donalds (98.9%)
Donalds enters Tuesday from a position of overwhelming strength. The U.S. representative has President Donald Trump's endorsement and has consistently held a substantial polling advantage throughout the Republican primary, with several summer surveys placing him far ahead of Fishback, Lt. Gov. Jay Collins and former Florida House Speaker Paul Renner.
That polling advantage has increasingly translated into prediction-market dominance. Donalds spent much of the race trading comfortably above the rest of the field before accelerating toward 99% as the primary approached. Even before Election Day, major national coverage described Donalds as the expected winner of the Republican nomination.
At 98.9%, there is essentially no meaningful upside remaining in the market price, but the number reflects how little uncertainty traders believe remains. With no votes counted in the screenshot yet, the nomination has not officially been decided, but both the market and recent public polling heavily favor Donalds.
James Fishback (0.8%)
Fishback's campaign has generated considerably more attention than his current market probability would suggest. The investor entered the race as an outsider and briefly pushed his prediction-market probability into double digits, but public polling never showed him approaching Donalds. Polling in June had Fishback at 8%, July averages generally placed him around 9%-10%, and an early August survey dropped him to just 4%.
Fishback has remained outside the Republican Party's mainstream establishment while generating frequent headlines through provocative rhetoric, online campaigning and clashes with party figures. He was disinvited from a Florida Republican Party event in June, while a Ted Cruz-aligned group later spent money attacking him over remarks it characterized as antisemitic. Media coverage has repeatedly focused on his controversial statements and appeal to parts of the online right rather than on evidence that he was closing the electoral gap with Donalds.
That distinction matters when looking at the market. Fishback has demonstrated an ability to generate attention, but attention has not translated into sustained polling strength or prediction-market confidence. His move from roughly 12% at his March market peak to below 1% on primary day indicates that traders increasingly came to view an upset as extremely unlikely.
Florida Republican Primary Market Outlook
The available market and polling data leave Fishback with only a very narrow theoretical path. Prediction markets can be wrong, particularly before votes are counted, but a fall from roughly 12% to 0.8% combined with repeated single-digit polling represents a dramatic deterioration rather than a late surge.
Donalds, meanwhile, enters primary night above 98% after consolidating the position he held for most of the campaign. Fishback has succeeded in remaining part of the political conversation and generating headlines, but the current market treats the actual nomination contest as overwhelmingly tilted toward Donalds.
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