John E. Sununu maintains a commanding lead in New Hampshire’s Republican Senate primary, scheduled for September 8, due to strong name recognition from his prior service as U.S. senator, consistent polling advantages of roughly 35–40 points over Scott Brown, and Trump’s early endorsement. Recent surveys from the University of New Hampshire and Saint Anselm College show Sununu at 54–60% among likely Republican primary voters, performing especially well with moderates and libertarians, while Brown trails at 20–24% and other candidates remain negligible. Sununu’s ground campaign and decision to limit additional debates have reinforced momentum with days remaining. A late scandal, health development, or unexpected turnout surge could still narrow the margin before voting concludes.