Stefany Shaheen holds the leading position in trader consensus for the September 8 Democratic primary in New Hampshire’s open 1st congressional district, driven by her established name recognition as the daughter of retiring Senator Jeanne Shaheen and a series of recent endorsements from every Democratic mayor in the district plus the first major union backing. Early University of New Hampshire and Saint Anselm surveys show her ahead amid substantial undecided shares, while Maura Sullivan maintains second place through stronger fundraising totals and her background as a Marine Corps veteran and former Obama administration official. Heath Howard and Carleigh Beriont trail in both polling and organizational support. A recent Manchester candidate forum highlighted broad agreement on issues including housing costs, healthcare access, and immigration policy, though the open-seat contest leaves room for shifts before primary day.