Kelly Ayotte's commanding 98.7% implied probability reflects her status as the Republican incumbent seeking a second term in the September 8, 2026 primary, backed by a decisive 2024 general election victory and established party infrastructure. Corey Lewandowski's brief consideration of a challenge in late 2025, tied to disputes over congressional redistricting, failed to produce a formal campaign or significant endorsements, leaving only minor declared opponents. Traders assign negligible weight to an upset given the short timeline to the primary and absence of major polling shifts or institutional defections. A late-breaking development such as a high-profile endorsement reversal or unexpected candidacy filing could theoretically narrow the gap, though no such signals have emerged.