Stefany Shaheen holds a strong lead in the September 8, 2026, Democratic primary for New Hampshire’s 1st Congressional District, an open seat following Chris Pappas’s Senate bid. Her position stems from high name recognition as the daughter of longtime U.S. Senator Jeanne Shaheen, combined with recent local endorsements from mayors and healthcare leaders, a formal campaign launch in June 2026, and emphasis on medical research and community service. Maura Sullivan, a Marine veteran and former Obama administration official who previously ran in the district, trails with a platform focused on veterans’ issues and national security but limited recent momentum. Lesser-known contenders Carleigh Beriont and Heath Howard lack comparable fundraising visibility or organizational support at this stage. Trader pricing reflects these structural and visibility advantages ahead of the late-summer primary.