Stefany Shaheen holds the lead in the September 8 Democratic primary for New Hampshire’s open 1st Congressional District seat, backed by consistent early polling advantages and endorsements from every Democratic mayor in the district plus both U.S. senators and major labor groups. Her name recognition as the daughter of Sen. Jeanne Shaheen and prior local office experience provide a structural edge in an electorate where more than one-third of voters remain undecided. Maura Sullivan trails despite leading in total funds raised and cash on hand through March, drawing on her Marine Corps background and Obama administration service. Recent candidate forums in Manchester have focused on housing, healthcare, and immigration, though no major shifts in standing have emerged since January surveys. High undecided levels leave room for late movement ahead of the primary.