The 2026 New Hampshire gubernatorial election will determine the successor to incumbent Republican Governor Chris Sununu, who announced in July 2023 that he would not seek a fifth term. Sununu’s decision, which took effect at the end of his term in January 2025, created an open-seat race for the first time since 2016. The Democratic primary to select the party’s nominee is a key early step in the general election contest, and the outcome will shape the political landscape in a state that has trended Democratic in presidential elections but has elected Republican governors for most of the past two decades. New Hampshire’s governor serves a two-year term with no term limits, and the office holds significant power over the state budget, appointments to state boards and commissions, and veto authority over legislation passed by the Republican-controlled General Court. The Democratic nominee will face the Republican nominee in the November 2026 general election, and the primary is expected to attract multiple candidates given the open field. Potential contenders include Democratic state legislators, local officials, and figures from the business or nonprofit sectors. The primary will be held in September 2026, with the exact date set by the New Hampshire Secretary of State. The prediction market resolves when a candidate secures the nomination through a majority vote at the state Democratic convention or through a primary election, whichever mechanism the party uses. As of early 2025, no candidate has formally declared, but several names are being discussed by party insiders and political observers. The race will test the Democratic Party’s ability to rebuild after recent losses in statewide elections, including Sununu’s landslide reelection in 2022 and the party’s failure to flip the state’s two congressional districts in 2024. Interest in the market stems from the strategic importance of New Hampshire as a swing state in presidential elections and the potential for the governor’s race to serve as a bellwether for national political trends. The outcome will also affect policy on issues like education funding, abortion rights, and energy regulation, which are central to state politics.

Historical Context

New Hampshire has a history of electing Republican governors even as it has voted Democratic in presidential elections. Since 2000, the state has voted for the Democratic presidential candidate in five of seven elections, but only two Democrats have served as governor: John Lynch (2005-2013) and Jeanne Shaheen (1997-2003). Lynch won four two-year terms, while Shaheen served three before an unsuccessful Senate bid in 2002. Republican governors have held the office for 20 of the last 26 years. The open-seat race in 2026 is the first since 2016, when Sununu first won. That year, Sununu defeated Democrat Colin Van Ostern by 9 points. The Democratic primary process in New Hampshire has historically been a competitive affair. In 2022, Tom Sherman won the nomination with 54% of the vote in a five-candidate field, defeating progressive challengers like state representative Jon Morgan. In 2016, Van Ostern won a six-way primary with 34% of the vote. The state uses a semi-open primary system, allowing undeclared voters to participate in either party’s primary. New Hampshire’s gubernatorial elections are held every two years, and the governor shares power with a five-member Executive Council, which approves contracts and appointments. The state has no sales or income tax, making budget debates particularly contentious. Historically, Democratic governors have focused on education funding and social services, while Republican governors have emphasized tax cuts and business-friendly policies. The 2026 primary will also be shaped by national political dynamics, including the performance of President Joe Biden and the 2026 midterm environment.