Stefany Shaheen maintains a strong lead in the New Hampshire 1st District Democratic primary, scheduled for September 8, 2026, driven by name recognition as the daughter of U.S. Senator Jeanne Shaheen, prior service on the Portsmouth City Council, and consistent polling advantages in recent surveys such as the Saint Anselm College poll. Maura Sullivan, a former Marine captain, vice chair of the New Hampshire Democratic Party, and 2018 candidate for the seat, trails but has narrowed the margin through substantial fundraising and targeted campaigning focused on lowering costs and building statewide support. Heath Howard, a sitting state representative, and Carleigh Beriont, a Hampton selectwoman, remain distant contenders with limited polling visibility and smaller organizational footprints. Trader positioning reflects Shaheen’s structural edges in endorsements and local ties while acknowledging Sullivan’s resource base and potential for late momentum in the open-seat contest.