Stefany Shaheen holds a commanding position in the New Hampshire 1st District Democratic primary due to her strong fundraising totals exceeding $1.8 million as of March 2026, extensive local endorsements from mayors, health care leaders, and unions such as Teamsters Local 633, and name recognition tied to her service on the Portsmouth City Council and as daughter of U.S. Senator Jeanne Shaheen. Candidate forums in late May highlighted shared themes around federal policy opposition, yet Shaheen's established network and resources have consolidated trader support ahead of the September 8 primary. Maura Sullivan, a Marine veteran and former Obama administration official who previously sought the seat in 2018, trails with lower fundraising and visibility. Lesser-known contenders including Carleigh Beriont and Heath Howard show minimal momentum in recent filings and polling indicators. The September filing deadline introduced no major shifts that altered these dynamics.