John E. Sununu commands 91% implied probability in the New Hampshire Republican Senate primary market, driven by his prior service as U.S. Senator from 2003-2009, strong family ties to popular Governor Chris Sununu—who recently reaffirmed no interest in a 2026 Senate bid—and early positioning as the GOP's top recruit against Democratic incumbent Jeanne Shaheen. Absent major developments in the past 30 days, trader consensus reflects his superior name recognition, fundraising potential, and path-to-victory in the early primary state, where familiarity trumps newcomers. Scott Brown's 5.5% share lingers from past statewide runs but is weighed down by prior losses, while Dan Innis and others trail on visibility. Challenges could arise from a high-profile entrant like former Senator Kelly Ayotte, Chris Sununu reversal, or shifting endorsements ahead of the September 2026 primary.