This midterm season, political tension is running high. Democrats are aiming for a historic result: if the blue wave holds on Election Day, this could be their best midterm performance since 2006, when Republicans suffered major losses driven largely by the unpopular Iraq War. Whether history repeats is still an open question. “You don’t turn the Titanic around overnight,” Vice President JD Vance said in Toledo, Ohio, defending the administration’s record on the economy. Republicans want to prove there’s still time to slow the blue wave, but prediction markets aren’t fully convinced.
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Senate control odds today: Kalshi vs. Polymarket
On both Kalshi and Polymarket, Democrats’ odds of winning the Senate have climbed past 67%. That number still leaves room for doubt, unlike the House, where Democrats are above 90% on both platforms. That gap is how prediction markets signal that one race looks all but decided, which is why nearly all the attention is on the Senate.
Over the past week, according to DeFi Rate’s tracker, which averages both platforms daily, Democrats’ Senate odds climbed more than 4 points.
| Market | Kalshi | Polymarket |
| Senate control (Democrats) | 68% | 69% |
| House control (Democrats) | 91.7% | 93% |
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House control and “Democratic sweep” odds
It makes sense that the governing party’s odds wouldn’t be the strongest. Historically, it’s rare, though not impossible, for the party in power to hold onto both chambers. Here, the House is the less competitive race, and the real question is how much ground the GOP loses, if any.
On Kalshi, the “Balance of Power” contract puts a full Democratic sweep of Congress at 68%. Traders see it as less likely that Democrats lose the Senate while winning the House: that split sits at 26%. Less likely still: a red wave reaching both chambers, at just 8.6%.
Least likely of all is Republicans winning the House while Democrats take the Senate, at 0.6%. Still, the unlikely does happen sometimes.
If you want to read more about the elections, check out our midterms predictions and visit Prediction Pro.
The seats that decide control: Texas, Ohio, Michigan, North Carolina, Kansas
All eyes are on five states. Some experts call them toss-ups. Prediction markets see it differently:
- Texas: Democratic state Rep. James Talarico leads Republican Attorney General Ken Paxton at 68%. It’s one of the most important races on the map; Democrats haven’t won a Texas Senate seat since 1988.
- Ohio: Former Sen. Sherrod Brown leads Sen. Jon Husted on prediction markets, at 71%.
- Michigan: Abdul El-Sayed, both before and after his debate against former Rep. Mike Rogers, sits at 69% to win the seat.
- North Carolina: Former Gov. Roy Cooper holds a wide lead over Michael Whatley, at 96%.
- Kansas: The only one of these five states where a Republican is favored. Sen. Roger Marshall is ahead of Democrat Adam Hamilton, 61% to 39%.
What the latest polls show
Some expert forecasts, like Cook Political Report, line up with what prediction markets are showing, though no single model is foolproof, and this is just one point of agreement for now. Brown leads Husted in Ohio; Talarico leads Paxton in Texas.
A Fox News poll, on the other hand, had the Texas race essentially tied, 49% to 49%. In North Carolina, an Elon University poll gave Cooper a lead too, though by a smaller margin than Kalshi or Polymarket imply.
Not every signal points the same way.
Senate Majority Leader John Thune told Fox News Digital that Republicans aren’t giving up on any of the competitive states, and argued that pollsters tend to underestimate the GOP in every election. At the same time, money talks: Republican groups have pulled back campaign spending in states like North Carolina, Georgia and Kansas; which could be read as an early sign of which way those races are heading.
How many seats Democrats need
Democrats currently hold 47 of the Senate’s 100 seats, to Republicans’ 53. Reaching a majority means winning four more, and Texas could be the state that decides this election. There’s also an unlikely but not impossible scenario: Republicans and Democrats ending up tied 50-50. In that case, the tiebreaking vote would go to Vice President JD Vance.
How the story ends is still anyone’s guess. We’ll have to wait and see what happens to the Titanic… and how many waves, of what color, come crashing in.
