The competitive open U.S. Senate race between DFL Lt. Gov. Peggy Flanagan and Republican Michele Tafoya, with recent polls showing a narrow Flanagan edge of 1–3 points amid high undecided shares, is the main driver elevating turnout expectations into the 2.75M–2.9M range. Record primary participation in August, extended early voting since mid-September, and coordinated get-out-the-vote efforts targeting low-propensity and younger voters have sustained momentum into the final weeks. Coinciding statewide contests for governor and the legislature add salience, while Minnesota’s historically strong midterm participation rates provide a baseline. Traders appear to weigh these mobilization factors against typical off-year drop-off, leaving room for shifts from late campaign events or weather on November 3.