Stefany Shaheen holds the lead in the September 8, 2026, New Hampshire 1st District Democratic primary due to her established name recognition as the daughter of U.S. Senator Jeanne Shaheen, prior local office experience, substantial fundraising advantage exceeding $1.8 million, and endorsements from multiple mayors and labor groups. Maura Sullivan, a Marine veteran and former Obama administration official, maintains second place through her military background and prior congressional bid, though trailing in recent polling and resources. Candidate forums in late May reinforced themes of opposition to federal policy shifts, with no major developments altering the field in the past week. Other entrants including Carleigh Beriont and Heath Howard register lower support amid a crowded field where early surveys and financial metrics favor the top two contenders.