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A Senate candidate can lead by about three points in the polls and be priced at about 70% to win in a prediction market. That looks like a contradiction, and Bloomberg has warned readers not to let it confuse them: the two numbers describe a similar picture in different ways.
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Here is why polls and markets look so different on the eve of the midterms, a table that shows how a few points of polling lead translate into market odds, and why Nate Silver says several Democratic Senate leads are fragile.
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All figures are dated snapshots from the sources named. They are not predictions or guarantees. For live odds, see our 2026 midterm elections predictions hub.
The Puzzle in One Table
| Race | Polling average lead | Kalshi price | Silver Bulletin margin |
|---|---|---|---|
| Minnesota (Flanagan, D) | Just under 6 points (VoteHub) | 90% to 90.5% | Not checked |
| Ohio (Brown, D) | Not checked | 71.3% | D +3 |
| Alaska (Peltola, D) | About 1.8 points | 70.3% | D +3.6 |
| Texas (Talarico, D) | About 3.4 points | 68.6% | D +2.5 |
| Maine (Jackson, D) | About 3.5 points | 68.3% | D +2.4 |
| Iowa (Turek, D) | About 0.4 points for Turek | Hinson (R) 56.0% | Not checked |
Polling averages are from 31 October and 1 November. Prices are from 1 November, mostly at noon Eastern. Minnesota’s figures are from Bloomberg’s example.
Look at the pattern. A lead of about 6 points is priced near 90%. A lead of about 2 to 3.5 points is priced near 70%. And in Iowa, a polling average that is nearly tied has a Republican priced as the favourite at 56%.
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A Margin Is Not a Probability
A poll average measures how far ahead a candidate is. A market price estimates how likely that candidate is to win. They are different questions, and the link between them depends on how much polls can be off.
If polls can miss by about three points either way, a three-point lead is a decent bet but far from safe. A six-point lead is a much better one. That is the Minnesota example in Bloomberg’s piece: a solid but not safe margin, and a price of 90%.
Prediction markets also add what traders believe about turnout, late news and polling error. A price is a view on the outcome, and a poll is a snapshot of opinion.
Why Silver Calls the Leads Fragile
Nate Silver’s model shows Democratic leads of about 2.4 points in Maine, 2.5 in Texas, 3 in Ohio and 3.6 in Alaska. Writing last week, he said those leads are each a “normal-sized polling error” away from flipping, according to a local news summary of his column.
If polls were off by three or four points toward Republicans across the board, most of those leads would disappear together. Silver also notes that the error could run the other way, and that polls in the last two midterms, 2018 and 2022, were fairly accurate.
| Scenario | What it would mean |
|---|---|
| Polls are accurate | Democrats win most of the close Senate races |
| Polls miss by 3 to 4 points toward Republicans | Most of the close Democratic leads vanish at once |
| Polls miss by 3 to 4 points toward Democrats | Democrats win the close races and possibly Iowa |
The key point: races do not miss independently. Polling errors tend to move together, so a miss in one state is often a miss in several.
What Past Polling Misses Look Like in Texas
ABC13 in Houston reports that in each of the last three big statewide races in Texas, the final polls missed the result by 3.6 to 4.7 points, and that every public Senate poll this month shows a closer race than that. Record early turnout, it adds, tells you people are showing up, not who is winning.
Our Texas Senate odds guide has the latest on that race.
Markets, Polls and Models Side by Side
| Source | Senate |
|---|---|
| Kalshi | Democrats 69% to 72% |
| Polymarket | Democrats 71% to 72% |
| Silver Bulletin | “Meaningful edge” for Democrats. 75% about 20 October |
| Decision Desk HQ (29 Oct) | Democrats 60% |
The sources agree on direction and differ on confidence. Decision Desk HQ’s model is the most cautious, and the markets and Silver are closer to each other. That spread is a reminder that “the probability” depends on whose model you use.
How to Read the Two Together
- Start with the margin. A lead of one or two points is within the usual polling error.
- Then look at the price. It tells you what traders believe about the outcome.
- Check how much has traded. A market with tens of millions traded is harder to move than one with a few thousand dollars.
- Compare more than one source. A market, a model and a polling average disagree, and the disagreement is information.
- Remember what 70% means. The other outcome happens about three times in ten.
A Caution About Both
Researchers at the University of Washington’s Center for an Informed Public warn that odds can be misread as results, and that sharp swings on election night could be used as supposed evidence of things they are not. Our guide to trusting election odds covers this.
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Roughly two dozen states prohibit betting on elections under existing law, and most Americans polled oppose it. Nothing here is a recommendation to trade. See our prediction market politics state-by-state guide.
Frequently Asked Questions
Why do prediction markets look more certain than polls?
A poll average shows a margin, and a market price shows the chance of winning. A lead of about three points can be priced near 70% because polls can miss by that much.
Are prediction markets more accurate than polls?
They answer a different question. Platforms say markets are well calibrated, and critics say many are thin. Neither is always right.
What did Nate Silver say about the Senate?
That Democratic leads in several Senate races are each a normal-sized polling error from flipping, and that a miss of three or four points toward Republicans would erase most of them. He also noted the error could run the other way.
How big are typical polling errors?
In Texas, final polls in the last three big statewide races missed by 3.6 to 4.7 points, according to ABC13. Nationally, polls in 2018 and 2022 were fairly accurate, according to Silver.
Which Senate races are the closest in the polls?
Iowa is essentially tied in the polling average, and Alaska, Maine and Texas show Democratic leads of about two to three and a half points.
Should I trust the odds or the polls?
Use both, along with models, and treat all of them as probabilities, not results.
Prediction markets are not sportsbooks. Event contract trading involves significant risk and is not appropriate for everyone. You can lose your entire stake, and most people who trade on prediction markets lose money. Platforms are typically 18+ and are not available in all states, and some states prohibit betting on elections. Polls, models and prices are snapshots, not predictions or guarantees. This article is informational and is not financial, legal or voting advice. GamingToday does not endorse any candidate or party. If gambling or trading stops being fun, call 1-800-GAMBLER for confidential support.
