The closely matched probabilities across mid-range turnout buckets in New Hampshire’s 2026 Senate race reflect uncertainty over mobilization in a competitive open-seat contest to succeed retiring Democrat Jeanne Shaheen. Recent polls show Democrat Chris Pappas holding a modest edge over Republican John Sununu ahead of the September 8 primaries, sustaining expectations of strong get-out-the-vote efforts from both parties in a state with historically elevated midterm participation relative to national averages. Factors such as the final nominees’ appeal, national midterm dynamics, early and absentee voting access, and weather on Election Day could shift overall ballots cast. Higher turnout would likely favor organized Democratic efforts in this battleground, while subdued participation might align with typical off-year patterns unless the race tightens further or draws unusually intense national attention.