The non-competitive nature of the 2026 Oklahoma Senate contest between Republican Kevin Hern and Democrat N’Kiyla Thomas, rated Safe or Solid Republican by forecasters, anchors trader expectations for moderate turnout near 1.15 million votes. With the seat open after Markwayne Mullin’s resignation and a projected Republican margin exceeding 25 points, limited mobilization on either side and low national attention constrain upside surprises. Voter registration closed October 9 and absentee requests end October 19, while early voting begins late in the month, leaving the final two weeks as the main window for shifts. The near-even pricing between the 1.1–1.2 million and 1.2–1.3 million bins reflects uncertainty over base Republican participation and any late surge in absentee or early ballots.