How the contract works
A contract on this market settles at $1 if the Democratic nominee wins the 2026 New Hampshire Senate election, including any run-off, and settles at nothing if the Republican or another candidate wins. The settlement date is 4 November 2026, the date of the general election, with resolution following whatever winner is called by the Associated Press, Fox News and NBC once all three agree. The price at any moment reflects what buyers and sellers currently think the chance of a Democratic win is: a contract priced at 0.30, for example, would imply traders see roughly a three-in-ten chance, not this market's actual price. A position bought on this question can typically be sold again before settlement, at whatever price the market has moved to by then.
Yes99%
No1%
Probability
How the price has moved
The only venue tracked, Polymarket, shows the market-implied probability at 100%, with $683,101 in total trading volume behind that figure. Because today, 4 November 2026, is both election day and the contract's settlement date, a reading at full certainty is consistent with a market already responding to reported results or an expected call rather than one still forecasting an outcome weeks in advance. No separate figures for the market's range over the prior day or week were available, and no cause for the current level beyond the election itself is reported.
Analysis
Context
New Hampshire's Senate seat is open in 2026 because Jeanne Shaheen, the state's senior senator since 2008, chose not to seek a fourth term. That makes this the first open-seat Senate race in the state since 2010, removing the incumbency advantage that has helped Democrats hold the seat for three straight cycles. The race is one of a handful nationally that could tip the balance of the Senate, which is why national party committees and outside groups have paid close attention to it throughout 2026.
New Hampshire's politics make it an unusual battleground. The state has a Republican governor and a legislature that has swung between the parties, yet it has sent only Democrats to the Senate in every election since 2008. That split between state and federal voting patterns is central to how analysts read this race, and it is part of why the market's current pricing leans so heavily toward a Democratic hold despite the seat being open.
The clearest figure here is the consensus: 100% across the only venue tracked, Polymarket, with $683,101 in trading volume behind it. A reading pinned at full certainty, rather than sitting in the high 80s or 90s, tells you the market is not merely favoring a Democratic win but treating it as decided โ consistent with a race where results are already being reported on the day itself, 4 November 2026, rather than one still being forecast weeks out.
The structural case behind that pricing is New Hampshire's recent Senate history. Jeanne Shaheen won in 2008, 2014 and 2020; Maggie Hassan won in 2016 and 2022. Every Senate election in the state for nearly two decades has gone to the Democratic nominee, even in years โ 2014 and 2022 โ when the national environment favored Republicans. That streak matters more than usual this year because the seat is open, removing the incumbency factor that partly explained those past wins, so the market's confidence rests more on the state's underlying federal voting pattern than on any single candidate's personal strength.
Midterm dynamics also point the same direction. The party holding the White House has historically lost ground in Senate and House races in the first midterm of a presidential term, and if that pattern holds in 2026 it would reinforce rather than offset New Hampshire's existing lean toward Democrats in federal contests. The volume figure, just under $700,000 and concentrated on a single venue, suggests this is a market that traders consider largely resolved rather than one still being actively repriced โ a flat, maximal consensus is itself a signal, not an absence of information.
What moves the probability
New Hampshire's Senate streak
Democrats have won every U.S. Senate election in New Hampshire since 2008, across four separate contests and two different nominees. That pattern is the single strongest reason the market prices a Democratic win so heavily, since it has held even in midterm years that favored Republicans nationally.
Open seat removes incumbency
Jeanne Shaheen's retirement means neither party's nominee has run statewide as an incumbent senator, which is a real source of uncertainty relative to past cycles. This cuts against full certainty, even though the market currently treats the race as decided.
Midterm pattern
The president's party has typically lost congressional seats in first-term midterms historically, which would tend to help the opposition party nationally. In New Hampshire specifically, that national pattern layers on top of a state that already leans Democratic in Senate races.
Election-day results
Because 4 November 2026 is both election day and the settlement date, any early returns, exit polling, or network race calls from the Associated Press, Fox News or NBC will move the price directly and quickly as they are reported.
The case for
- The Democratic nominee benefits from a state that has elected only Democrats to the Senate in every cycle since 2008.
- If national midterm dynamics run against the president's party, that would reinforce rather than counteract New Hampshire's existing federal lean.
- A Democratic win would be called once the Associated Press, Fox News and NBC agree on the result, which is the standard this market follows.
- Statewide Democratic infrastructure built over four consecutive winning Senate campaigns remains in place for this race.
The case against
- The seat is open for the first time since 2010, removing the incumbency advantage that helped Democrats win the last three contests.
- New Hampshire regularly elects Republicans to the governorship and state legislature, showing its electorate splits its support rather than voting a single party down the ballot.
- Close margins have been common in New Hampshire Senate races historically, meaning a narrow outcome could delay a clear call past election night.
- A national environment that breaks differently than the usual midterm pattern could blunt whatever advantage Democrats might otherwise carry into this race.
What to watch
The remaining hours of 4 November 2026 are the entire window left on this question. New Hampshire's polls close at 7:00 p.m. and 8:00 p.m. local time depending on the town, after which the Associated Press, Fox News and NBC will issue their own race calls; resolution follows once all three agree, or official state certification if they do not. Given New Hampshire's history of narrow Senate margins, a close count could delay a unanimous network call even after polls close.
Trade this contract
Open on Polymarket
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