Updated August 19, 2026 · 10 min read · by Jake Hari
The Quick Answer
Byron Donalds is the clear favorite to be Florida's next governor. After his 48 percent primary win on August 18, Kalshi quotes a Republican hold at 78 to 80 cents against 21 to 23 cents for Democrat David Jolly, Polymarket says 81.5, and our frozen five-seat model panel says 85 percent. The full graded primary board, the strange day-one flow into the Jolly side, and what would actually change the number are all below.
Florida's Republican voters made it official on August 18: Byron Donalds is the GOP nominee for governor, and the prediction markets saw it coming and never blinked. Kalshi closed Donalds at 98 cents and Polymarket had him a hair under a dollar, while every one of his eight rivals sat in the pennies. This page has tracked that market since early August, so now it does the honest thing a verdict page owes its readers: it grades the closing prices against the certified result, shows which trades actually paid, and then turns to the race that is still open, the November contest against Democrat David Jolly. That general-election board is already trading, and its first full day of post-primary, two-way trading produced the strangest number of this whole cycle: the 21-cent Democratic side is out-trading the Republican favorite. The full graded board, and what that 21 cents actually says about the DeSantis succession, is below.
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The Market
| Venue | Kalshi and Polymarket, both CFTC-regulated event-contract venues |
| The Event | "Who will be the Republican nominee for Governor of Florida?" sold as one yes/no contract per candidate |
| The Contract | Each market resolved YES for the candidate certified as the GOP nominee from the August 18, 2026 primary, per Kalshi's settlement rules |
| Settled | August 18, 2026, once the race was called |
| Prices Below As Of | the August 18, 2026 close (the last book before the polls closed) |
How It Settled: Grading Kalshi And Polymarket
The result was not close. Donalds won the nomination outright, and both venues had priced it that way for weeks. Here is the full field, every candidate on the board, with the closing price on each venue and the outcome. This is the entire certified field, nothing dropped.
| Candidate | Kalshi close | Polymarket close | Result |
|---|---|---|---|
| Byron Donalds | 98¢ | 99.9¢ | ✅ Won |
| James Fishback | 1.3¢ | 0.1¢ | Lost |
| Jay Collins | 0.3¢ | 0.1¢ | Lost |
| Casey DeSantis | 0.1¢ | 0.1¢ | Lost |
| Wilton Simpson | 0.1¢ | 0.1¢ | Lost |
| Jimmy Patronis | 0.1¢ | 0.1¢ | Lost |
| Matt Gaetz | 0.1¢ | 0.1¢ | Lost |
| Paul Renner | 0.1¢ | not listed | Lost |
| Charles Burkett | 0.1¢ | not listed | Lost |
The count backed the price. Donalds took 807,858 votes, 48 percent of a nine-way field, with Jay Collins second at 425,332 and 25 percent: a 23-point gap over the man the polls, and our own panel, had treated as the live challenger. A 98-cent favorite that wins by 23 is the market doing its job. Both books were, for practical purposes, correct to the penny. The one small texture worth naming: Kalshi kept a faint pulse on James Fishback at 1.3 cents while Polymarket flattened him to a tenth of a cent. That was not a disagreement about the winner. It was a longshot residue, and it points at the strangest number on the board.
Which trades paid. Buying Donalds YES at 98 cents returned a dollar, a gross gain of roughly 2 percent for holding a near-certainty a few weeks, before fees. The louder story sits on the other side of the book. Fishback, the online-provocateur candidate, drew the heaviest speculative action of anyone who lost: roughly 34.8 million contracts of open interest on Kalshi and about 6.5 million dollars of volume on Polymarket, more than the winner's own 8.7 million contracts of Kalshi open interest. Every dollar of it settled to zero. In hindsight the board's clearest losing tickets were the pennies riding on Fishback, a contract that pulled the most speculative money on the board and still resolved NO.
One ugly note from the primary belongs in the record. In the campaign's final weeks, James Fishback publicly accused Donalds of being under federal investigation for sex trafficking, an allegation he attributed to an anonymous whistleblower. The Department of Justice refuted the claim, stating Donalds was not under investigation, and the Donalds campaign called it a "baseless and defamatory sideshow." The market never treated the attack as a real threat: Fishback's own contract stayed in the pennies and settled NO, and Donalds's price never wavered from the high 90s. Fishback's full market arc — the win market, the vote-share ladder, and what Kalshi listed on him next — is tracked on our James Fishback odds page.
Did Our Own Panel Beat The Market?
We publish these verdicts so we can be graded in public, wins and misses alike, so here is our own scorecard. On August 3 our price-blind panel scored this exact board without seeing a single market price. It landed on the right winner but hedged harder than the crowd did:
- Byron Donalds: 81.6% (market: 98¢)
- Jay Collins: 13.6% (market: under 1¢)
- James Fishback: 2.7%
- Paul Renner: 1.0%
The panel was right that Donalds was the man. It was wrong to leave 18 cents of doubt on the table, and most of that doubt went to Jay Collins, the appointed lieutenant governor the models treated as the live challenger. Two seats said so out loud at the time:
Sonnet kept Collins as "the real risk to this pick," citing "the Lt. Gov. appointment, multimillion-dollar ad blitz."
[Editor's note: Collins finished far back, with a closing price of three-tenths of a cent and a NO settlement. The "real risk" never materialized; the market's confidence was the better read.]
"His minimum within-poll lead over the runner-up is ~16 points," and "Florida's no-runoff plurality rule means he needs only ~30-35% of the vote in a fragmented field." — Kimi, August 3
Kimi's logic aged well: a wide, stable polling lead plus a plurality-wins rule is exactly the setup that turns into a blowout, and it did. The lesson we are keeping is the one the grade teaches. When a deep, liquid market is at 98 cents and the panel is at 82, the gap is usually the market pricing certainty the models are trained to hedge. Score this round for the crowd.
This settled board now becomes track record. Every number above is graded on the public model-verdict scoreboard, which recomputes as markets settle.
The Look Ahead: Donalds Vs. Jolly For The Governorship
The primary is over; the governorship is not. Donalds now faces Democrat David Jolly, a former Republican congressman from the Tampa Bay area who switched parties and won his own primary the same night — and won it comfortably, with 754,725 votes and 61 percent of the Democratic field. Both venues have priced the general election, and they agree: this is Donalds's race to lose, but it is not a formality. On Kalshi's party-winner market the Republican side opened its first full post-primary day quoted 78 to 80 cents on a 2-cent spread, with the Democratic side at 21 to 23; Polymarket has the Republicans at 81.5 and the Democrats at 17.5.
We ran the panel again on the one question that is still open, "will a Republican be inaugurated as governor of Florida after the 2026 election," with the market price hidden and the same fetched facts in front of every seat. Five of the panel's eight seats scored this board.
The Board
| Outcome | Why it is priced here | Market (Kalshi / Polymarket) | Panel blend |
|---|---|---|---|
| Republican (Byron Donalds) Wins | Trump-endorsed nominee; state has moved sharply red | 78–80¢ / 81.5¢ | 85% |
| Democrat (David Jolly) Wins | Crossover pitch, but running uphill in registration and recent margins | 21–23¢ / 17.5¢ | 15% |
The panel blend is the median of five price-blind model estimates after a revision round. Market prices are each venue's book as of August 19, 2026; Kalshi is quoted bid/ask because the young book's 2-cent spread makes a single "price" misleading.
What 21 Cents Actually Implies
Read the Democratic side literally and the market is saying Jolly has roughly one chance in five of ending a streak of seven consecutive Republican wins in Florida governor races; no Democrat has won the office since Lawton Chiles in 1994. One-in-five is not nothing. It is far more respect than an R+13-to-R+19 state's recent history would hand any Democrat, and it is the market pricing exactly the scenario the panel flagged below: a party-switch candidate built to contest the suburban voters Florida Democrats lost, in an off-year environment that historically leans against the party in the White House.
The flow is the stranger signal. In the 24 hours after the primary settled, the Democratic leg traded about 16,400 contracts against 10,700 on the Republican leg, and it now carries more open interest too, roughly 92,000 contracts to 71,000. If that pattern sounds familiar, it should: it is the same shape as the primary board, where the cheap Fishback contract drew the heaviest speculative action of any name that lost. Longshot money chases the big payout, and on day one of this general it is chasing Jolly at 21 cents. That flow also explains the drift. The Republican side was quoted at 82 cents on primary night and re-opened at 78 to 80 a day later, a move of a few cents that says more about a thin young book absorbing longshot demand than about anything that changed in the race. Treat the 2-cent spread as the honest error bar on every number in this section.
A Worked Example: What 23 Cents Buys
Here is the arithmetic behind that pull, worked through once. One Jolly YES contract at the 23-cent ask risks $0.23 to collect $1.00 if Democrats win the governorship, about a 3.3-to-1 payout on an outcome the book itself prices at 21 to 23 percent. The same dollar on the Donalds side costs 80 cents at the ask and returns 20 cents of profit on a win. Neither of those is a recommendation; it is simply the math that makes the cheap side of every lopsided political board the busier one.
Every Seat's Number
| Seat | Round 1 | Round 2 (final) |
|---|---|---|
| Claude Fable | 92% | 85% |
| Claude Opus | 85% | 86% |
| Claude Sonnet | 87% | 85% |
| GLM | 83% | 86% |
| DeepSeek | 80% | 85% |
| Median Blend | 85% | 85% |
Every seat on this panel is graded against real market settlements — records to date: Claude Fable 84% on 508 graded calls · Claude Opus 85% on 578 graded calls · Claude Sonnet 84% on 556 graded calls · GLM 81% on 2,367 graded calls · DeepSeek 80% on 2,392 graded calls. Recomputed daily; the full scoreboard is public.
These are model estimates, not predictions of fact and not financial advice. The models were scored without seeing any market prices, and they are graded against real settlements all summer and are wrong regularly. Event contracts are for adults 18 and older where legal.
The panel lands above the market — 85 against a book quoted 78 to 80 as of August 19, a gap that has widened from three points on primary night to roughly six measured at the midpoint of that quote, as the young market absorbed its first day of longshot flow. That is still a modest, honest disagreement, and it comes from the fundamentals every seat was handed. Florida was a true tossup as recently as 2018, when Ron DeSantis won the governorship by four-tenths of a point over Andrew Gillum. It has not been close since. DeSantis won re-election by 19 points in 2022, the widest Florida gubernatorial margin since Jeb Bush in 2002; Donald Trump carried the state by 13 in 2024, its biggest presidential margin since 1988; and Republicans now lead voter registration by more than 1.5 million, a swing of nearly two million from the roughly 280,000-voter Democratic edge that existed when DeSantis first won. The post-primary head-to-head polls sit right on top of the market: Donalds leads by about 4 points in the Pollsmax blended average, which folds in earlier and lower-margin surveys, and by five to seven points in the most recent individual Stetson, UNF, and James Madison Institute polls, while the Pollsmax forecast model puts the Republican at 83 percent.
More live boards from the same panel: 2026 Governor Races: every battleground — Texas R 88¢, Georgia R 42¢, Michigan R 16¢ · 2026 Midterm Election Odds: every race, one board. Prices fetched August 18, 2026.
Where The Panel Changed Its Mind
We let every seat read the others' anonymized reasoning and revise once. The movement was toward the center, and the most useful arc belonged to the seat that started highest:
"Donalds leads by 4 to 7 across all post-primary polls in a state that moved R+13 to R+19 in its last two cycles, with registration and fundraising edges." — Claude Fable, who trimmed from 92% to 85% after reading the panel, keeping its read of the fundamentals but conceding that a full fall campaign against a funded opponent is not a two-point race.
"Republican leads in polls, fundraising, and voter registration." — DeepSeek, which moved the other way, from 80% up to 85%, once it weighted the 1.5-million registration gap and the R+13 presidential result more heavily than a generic incumbent-party discount.
Claude Opus barely moved, from 85% to 86%, and its reason for holding is the whole case in one line: a nominee leading every poll in a state trending this hard does not need the number revised, only defended. The seats converged near 85 without being told to.
What Would Change The Panel's Mind
Every trigger here is event-shaped, so you can check it yourself as the race unfolds. Each note says which way it pushes the Republican number.
- A Single-Digit September Head-To-Head For Jolly (pushes down): the five-to-seven-point Stetson, UNF, and James Madison Institute margins are the market's polling anchor. If the next wave from those same Florida pollsters lands inside the margin of error — particularly if Jolly is consolidating the Tampa Bay suburbs he once represented as a Republican — the 78-to-80 book has real room to fall.
- A Closed Money Gap In The Q3 Filings (pushes down): every seat's case leans on Donalds's fundraising edge. Florida's next campaign-finance reports will show whether Jolly's 61 percent primary-night consolidation turned into actual money; a closed gap there is signal, not noise.
- A National Environment Shift (pushes down): a sharply Democratic generic ballot by October would drag even safe-red statewide races toward the middle.
- Early-Vote Registration And Turnout Banking A Red Edge (pushes up): Florida reports party registration of returned ballots; a large Republican lead there before Election Day would firm the number toward the mid-80s or higher.
The Traps: Why 79 Cents Is Not 99
The primary market's 98 cents was a near-certainty. The general market's 78-to-80-cent book is not, and the models were careful not to treat it as one. The trap is reading Florida's recent blowouts as a lock. The 2018 race was decided by four-tenths of a point, which is the reminder every seat kept in view: this is a state that can be close when the matchup is right. Jolly's entire pitch is that a former Republican can win back the suburban and independent voters who drifted away, and a party-switch novelty candidate is exactly the profile that could either overperform the polls or collapse under them. The honest read is the one both venues and the panel share: a strong Republican favorite, not a settled result, with a full general-election campaign left to move the number.
Settlement Timeline
| Primary Settled | August 18, 2026 (Donalds, YES) |
| General Election | November 3, 2026 |
| General Market Settles | when the winner is inaugurated, expected January 2027 |
| Next Catalysts | September–October head-to-head polling; Q3 fundraising filings; early-vote registration banking |
This page is re-scored when the story moves. Market prices are stamped as of August 19, 2026; the panel blend was fixed price-blind on August 18 and does not move with the book.
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More on this: 2026 Governor Races: Every Kalshi Board We Track · Florida Governor Primary Odds: Kalshi's Real Race Is Second · Why Byron Donalds (R) Will Win The Florida Governor Primary · Florida Governor Odds: Donalds Vs Jolly After The Primary · Why Ashley Moody (R) Will Win the Florida Senate Primary
The Bottom Line
The Florida governor primary was a clean win for the prediction markets and a useful humbling for our panel: Donalds closed at 98 cents, won by 23 points, and the crowd's certainty beat our models' caution. The general election is a different question with a different answer. Kalshi quotes a Republican hold at 78 to 80 cents, Polymarket says 81.5, our five-seat panel says 85, and in the first post-primary day the longshot money piled onto the 21-cent Jolly side, the same shape the Fishback contract traced all summer. The fundamentals, recent margins, registration, and head-to-head polling all point the same direction without erasing the memory of how close 2018 was. Donalds is the clear favorite to succeed DeSantis. He is not yet the governor, and this board will grade itself in public when he either becomes one or does not.
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