Stefany Shaheen holds a strong lead in the September 8, 2026, Democratic primary for New Hampshire’s 1st Congressional District, driven by name recognition as the daughter of longtime U.S. Senator Jeanne Shaheen, early endorsements from local mayors, and the first major union backing. Fundraising totals and organizational support further reinforce her position ahead of Maura Sullivan, a Marine veteran and former Obama administration official who previously ran for the seat in 2018 and maintains competitive fundraising but trails in polling and local party infrastructure. Carleigh Beriont, Heath Howard, and other entrants remain marginal factors in the race. Recent candidate forums have focused on opposition to federal policy shifts, yet no late developments have significantly altered the established frontrunner dynamic reflected in trader consensus.