US Senate Election Odds: The State Of Play Entering The Final Week
When we last assessed the various races that will determine who controls the Senate, and with it the fate of much of President Donald Trump’s agenda, the signals from betting apps pointed to a Democrat victory by 52-48.
That would represent a five-seat change from 2024, when the Republicans won 53-47.
As we enter the final stretch, that projection hasn’t changed. The overall betting, however, has moved sharply in favour of the Democrats. Recommended on these pages at 9/10 back in April and 5/6 last month, they are now a best-priced 4/9 to gain Senate Control.
Here is the list of all states where the favourite is currently rated no more than 90% likely to win. Note, that no longer includes a projected Democrat gain in North Carolina - a 96% chance on average across betting sites.
How The Key States Stand:
State | Holder | Favs | %age |
New Hampshire | Dems | Dems | 90% |
Minnesota | Dems | Dems | 85% |
Alaska | Reps | Dems | 74% |
Michigan | Dems | Dems | 69% |
Ohio | Reps | Dems | 68% |
Texas | Reps | Dems | 66% |
Maine | Reps | Dems | 61% |
Iowa | Reps | Reps | 59% |
Kansas | Reps | Reps | 60% |
Nebraska | Reps | Reps | 71% |
S Carolina | Reps | Reps | 77% |
Florida | Reps | Reps | 89% |
Mississippi | Reps | Reps | 89% |
It is remarkable how little has changed over the course of the campaign in each race. Over the past five weeks, the shift in betting odds has been more than 5% in only four races.
Democrat chances improved by 8% and 10% respectively in Kansas and South Carolina. The Republicans by the same margins in Minnesota and Maine.
Bear in mind that major betting upsets in statewide races are very rare. If we focus on those races where the favourite is rated below 80%, only nine are still competitive. Only six are lower than 70% and none are below 59%.
Blue Wave Looks On
The broader picture implies a somewhat ‘set’ race. All the indicators - whether that be polling, prediction models, turnout indicators or approval ratings - point to a substantial shift to the Democrats. Trump’s approval is at a rock-bottom 37%, which makes him the most unpopular president ever at this point in the cycle.
Consequently, the question for bettors to resolve is whether we will see a blue trickle, wave or tsunami. A subsequent article on the House of Representatives elections - which represents the whole country as all 435 districts are up for election - will analyse that question in more detail.
But for the purposes of the Senate, a blue trickle would likely amount to the Republicans holding on or perhaps losing 51-49. A blue wave would be consistent with the current 52-48 projection, or perhaps 53-47. A blue tsunami would be 54-46 or more, including a usually unthinkable gain. Kansas, for example, hasn’t elected a Democratic senator since the 1930s.
Check out our BetBuilderAI predictions for Newcastle Vs Everton this weekend.
What Are The Best Bets?
At this late stage, caution is recommended in betting against a live trend. Early voting is well underway and the market is relatively informed.
For example in Nevada, early voting is prolific, expertly analysed by Jon Ralston and usually predictive. The odds about Democrat Aaron Ford for governor have collapsed in the past 48 hours.
To reiterate, if every Senate favourite wins, the Republicans win 48 seats. In the Total Republican Seats market, that is a 4/1 chance. This looks generous, given how many realistic permutations land on 48.
Late Clark mail dump of 5,500 ballots comes in nearly 3-to-1 for Dems, who now lead by 24,395 ballots statewide, or 5.5 percent.I am starting to see blue people...
— Jon Ralston (@RalstonReports) October 27, 2026
Nebraska Independent Can Upset The Odds
The wider trend could be described as ‘Trump unwind’. Demographics which swung most to the right over the past decade - especially white, rural voters - are turning against Trump in the greatest numbers.
These voter groups are especially dissatisfied over gas prices, tariffs, the associated cost of living. As they represent such a large chunk of the Republican base, if a sizeable proportion switch to the Democrats, stay at home, or vote third party, there is scope for huge turnarounds and therefore, big upsets in the betting.
Nebraska looks a classic case in point. Following such a polarised decade, it will be hard for many to make the full switch to a Democrat.
But in Nebraska, that isn’t an issue. The challenger here is Dan Osborn, a local independent who ran in the 2024 Senate race against Deb Fischer. On that occasion Osborn won 47%, losing by less than 7%, compared to Kamala Harris losing by 20% to Trump in Nebraska on the same day.
Obviously, conditions in 2026 are vastly more negative for the Republican, Pete Ricketts, who is only barely ahead in the polls with both men below a 50% average. The Governor race is also proving trickier than expected for the incumbent Republican.
Furthermore, there is an America First candidate, who could siphon right wing votes away from Ricketts and offer a palatable alternative to such voters who want to protest against Trump’s Republicans. At 9/4, Osborn appeals.
Recommended Bets
- Democrats to win Senate @ 4/9
- Republicans to win 48 seats @ 4/1
- Dan Osborn to win Nebraska @ 9/4
