Stefany Shaheen holds a commanding position in the September 8, 2026, Democratic primary for New Hampshire’s 1st Congressional District due to strong name recognition as the daughter of retiring U.S. Senator Jeanne Shaheen, combined with a series of recent local endorsements from Portsmouth-area mayors, health care leaders, and Teamsters Local 633. These factors have consolidated organizational and grassroots support ahead of Maura Sullivan, a Marine veteran and former Obama administration official who previously ran for the seat in 2018 and maintains a fundraising edge but trails in polling and endorsements. Lesser-known candidates Carleigh Beriont and Heath Howard remain on the margins with limited visibility. Market pricing reflects Shaheen’s structural advantages in a district where family political networks and early Seacoast support have historically shaped Democratic nominations, with the primary still months away and no major late shifts reported.