Stefany Shaheen leads the Democratic primary for New Hampshire’s open 1st congressional seat according to trader consensus, buoyed by consistent advantages in University of New Hampshire and Saint Anselm polling that show her well ahead of the field amid high undecided shares. Her endorsements from every Democratic mayor in the district, combined with strong name recognition as the daughter of U.S. Senator Jeanne Shaheen and a record of local service on the Portsmouth City Council and Police Commission, have consolidated early support among party regulars and Seacoast voters. Maura Sullivan follows as the main challenger, drawing on her Marine Corps background, prior congressional bid, and robust first-quarter fundraising, though she trails in surveys. Heath Howard and Carleigh Beriont occupy smaller shares, with Howard emphasizing progressive stances on foreign policy and Beriont highlighting academic and municipal experience. The September 8 primary remains months away, leaving room for shifts from further debates, endorsements, or turnout patterns.