The competitive open-seat New Hampshire Senate race between Democratic nominee Chris Pappas and Republican John Sununu, following Jeanne Shaheen’s retirement and easy primary wins on September 8, anchors trader expectations for midrange turnout in the 550K-650K range. Recent University of New Hampshire and Saint Anselm polls showing single-digit margins or statistical ties highlight uncertainty over base mobilization and independent voter participation in this purple state, where unaffiliated voters comprise a large share of the electorate and national Senate control stakes add intensity. Midterm dynamics typically produce lower participation than presidential years, yet strong name recognition on both sides and heavy outside spending— including Republican Senate Leadership Fund commitments—support elevated but variable engagement compared with historical benchmarks. Weather on November 3 or late surges in get-out-the-vote efforts could shift volumes higher or lower within the tightly bunched buckets.