Stefany Shaheen leads the NH-01 Democratic primary market at 80% because her established name recognition as the daughter of retiring U.S. Senator Jeanne Shaheen, combined with strong local fundraising from New Hampshire donors, multiple union and organizational endorsements, and consistent polling leads, positions her as the frontrunner ahead of the September 8 primary. Maura Sullivan trails at 17.5% as the primary challenger, drawing on her Marine Corps background, prior 2018 campaign experience, and veteran-focused messaging, though recent polls show limited movement closing the gap. Heath Howard and Carleigh Beriont remain at 1.5% and 0.3% respectively, reflecting their narrower progressive and local bases with minimal reported momentum in the final weeks. Trader consensus reflects these structural and campaign resource advantages for Shaheen in a multi-candidate field.