Stefany Shaheen leads the September 8, 2026 Democratic primary for New Hampshire’s open 1st congressional district, reflecting her name recognition as the daughter of retiring Sen. Jeanne Shaheen, prior local officeholding in Portsmouth, and endorsements from mayors, health care groups, and labor. Maura Sullivan trails as a Marine veteran and 2018 candidate with defense experience and fundraising capacity. Carleigh Beriont, Heath Howard, and lesser-known entrants draw limited support amid a crowded field focused on progressive priorities and opposition to federal policy shifts. Recent candidate forums and filings have reinforced Shaheen’s frontrunner status without major disruptions to the consensus reflected in current pricing.