Chris Pappas holds an 87% implied probability in the New Hampshire Senate market because traders view the open seat—vacated by retiring Democrat Jeanne Shaheen—as structurally favorable to the four-term Democratic congressman. Pappas secured his nomination decisively in the September 8 primary and leads recent University of New Hampshire polling at 50-42% against Republican John E. Sununu, reversing earlier narrow deficits. Sununu won his primary comfortably but carries the legacy of his 2008 Senate loss in the state and faces Democratic advantages in fundraising and voter registration. Forecasters rate the contest a toss-up or lean Democratic, yet the real-money consensus prices Pappas as the clear frontrunner ahead of the November general election.