Ohio Governor 2026

Mike DeWine is term-limited, and the fight to replace him is the most competitively-priced gubernatorial market of the 2026 cycle. The matchup is set: Republican Vivek Ramaswamy against Democrat Amy Acton, the former state health director.

What makes this one worth watching is that the two regulated books now disagree about who is ahead. Kalshi has Ramaswamy at 50.5% against Acton's 49.5%; Polymarket has Acton at 52.0% against Ramaswamy's 49.0%. That is a genuine sign flip, not a spread—one venue's marginal trader thinks the Republican wins and the other's thinks the Democrat does, in a race both agree is inside a point or two of even. This workspace pulls the winner markets from Kalshi, Polymarket, and Manifold side by side so you can read that disagreement directly, spotlights both party contracts on both venues, and tracks the trajectory into the November 3 election.

Kalshi runs candidate-level contracts (Ramaswamy, Acton); Polymarket and Manifold price the race by party. The two pies point in opposite directions—Kalshi's leans Republican by a point, Polymarket's leans Democratic by three.

The direct Republican contracts on each exchange. Kalshi has Ramaswamy at 50.5% on about $3.0k in 24-hour volume—the deeper of the two legs on that venue—while Polymarket's Republican line sits at 49.0%. The gap between them is the cleanest single number in the workspace.

Kalshi's daily history shows how the race has moved into the fall; Manifold's community market isolates the Vivek Ramaswamy question specifically as a third, play-money read.

• The sign flip is the story. Kalshi and Polymarket now name different favorites in the same race. Either the two books converge—in which case one is repricing—or the disagreement persists into November and one venue is simply wrong. Both are worth watching.
• Volume sits on opposite legs. Kalshi's turnover concentrates on the Ramaswamy contract; Polymarket's concentrates on Acton. Cross-exchange disagreement that lines up this neatly with where each book's flow is heaviest usually reflects venue composition more than new information.
• Nothing here is outside the margin. Every line in the stack is between 49% and 52%. Treat single-point moves as noise; the meaningful signal is a book breaking clear of 55% on either side.
• Election day is November 3, 2026; Kalshi settlement follows certification on January 14, 2027, which is why the Kalshi and Polymarket settlement dates differ by more than two months.
• The fundamentals cut against the Polymarket read. Ohio has trended Republican in recent statewide cycles, which makes Polymarket's Democratic lean the more interesting of the two prices—and the one more likely to move.

The same race from the Democratic side. Polymarket has Acton at 52.0%, its deeper leg at roughly $3.9k in 24-hour turnover, against Kalshi's 49.5%. Reading both pairs together is the point: the Democratic leg is where Polymarket's volume sits and the Republican leg is where Kalshi's does, which is likely most of why the two books disagree.