Ohio Senate race odds
Kalshi vs Polymarket · updated Oct 20, 1:02 AM ET
Democrats (Sherrod Brown) to win the Ohio Senate race: Kalshi 64.5¢, Polymarket US 63.5¢, Polymarket 63.5¢. The exchanges are 1¢ apart. A price of 67¢ means the market implies roughly a 67% chance; it is a price, not a forecast.
Ohio Senate betting odds by venue
| Venue | Democrats win | Odds | Bid | Ask | Volume |
|---|---|---|---|---|---|
| Kalshi | 64.5¢ | -182 | 64¢ | 65¢ | $3.9M |
| Polymarket US | 63.5¢ | -174 | 63¢ | 64¢ | $6.3M |
| Polymarket | 63.5¢ | -174 | 63¢ | 64¢ | $800k |
Each row prices the outcome it names, in cents; 50¢ is a coin flip. Volume is in each venue’s own units. Full venue comparison
Price history
Last 90 days, Democrats win. Kalshi solid, Polymarket dashed. A break in a line is a gap in the record, not a move.
Polls beside the prices
| Pollster | Fieldwork ends | Sample | Result | Lead |
|---|---|---|---|---|
| Bowling Green State University/YouGov | 2026-10-09 | 1,000 LV | Sherrod Brown 48 · Jon Husted 42 · Greg Levy 5 | +6 |
| co/efficient | 2026-10-06 | 925 LV | Jon Husted 44 · Sherrod Brown 43 · Gregory Levy 3 | +1 |
| co/efficient | 2026-10-06 | 925 LV | Jon Husted 46 · Sherrod Brown 45 | +1 |
| CNN/SSRS | 2026-10-05 | 760 LV | Sherrod Brown 49 · Jon Husted 43 | +6 |
| InsiderAdvantage | 2026-09-29 | 1,200 LV | Sherrod Brown 44 · Jon Husted 43 · Bill Redpath 4 | +1 |
| Big Data Poll | 2026-09-27 | 680 LV | Sherrod Brown 46.3 · Jon Husted 42.6 | +3.7 |
| Marist University | 2026-09-27 | 1,298 RV | Sherrod Brown 51 · Jon Husted 43 | +8 |
| Quantus Insights | 2026-09-23 | 695 LV | Sherrod Brown 47.8 · Jon Husted 47.3 | +0.5 |
Polls: VoteHub (CC BY 4.0). A poll is a separate reading of the same race; the two can differ with neither being wrong.
Common questions
What are the odds in the Ohio Senate race?
Democrats (Sherrod Brown) to win the Ohio Senate race: Kalshi 64.5¢, Polymarket US 63.5¢, Polymarket 63.5¢. The exchanges are 1¢ apart. A price of 67¢ means the market implies roughly a 67% chance; it is a price, not a forecast.
Why do Kalshi and Polymarket show different prices for the same race?
Each exchange is its own order book with its own traders, fees and rules. A gap of a cent or two is ordinary; a larger gap can come from a thin book or from a settlement-rule difference, which is why each venue links to its own contract.
Is the price a forecast?
No. It is what the best order or last trade implies at that venue. ThinBlimp shows both venues side by side and does not take wagers or give advice.
Open it in the terminal
Live card for this race — both venues streaming, the order book and related news.