John E. Sununu holds a commanding lead in the New Hampshire Republican Senate primary due to his prior service as U.S. senator from the state, strong name recognition, and established fundraising network ahead of the September 8 primary. Recent polling from sources such as UNH Survey Center and St. Anselm College shows him far ahead of former Massachusetts Senator Scott Brown and state Senator Dan Innis, reflecting broad party support and limited organized opposition. The Sununu family’s long political history in New Hampshire further bolsters his position among primary voters. A shift would require major late developments such as a significant scandal, sharp decline in turnout favoring challengers, or unexpected endorsements consolidating behind Brown or another contender in the final weeks.