The competitive open-seat Michigan Senate race between Democrat Abdul El-Sayed and Republican Mike Rogers, following Gary Peters' retirement, serves as the primary driver of trader expectations for turnout. Recent polling shows a narrow Democratic edge in a toss-up contest that has energized both bases, while the Democratic primary drew unusually high participation. Expanded early in-person and absentee voting options, alongside Michigan's pattern of solid midterm engagement, support projections clustering around 4.4-4.8 million total ballots. This range aligns with historical off-year figures below the 2024 presidential total of 5.7 million yet above lower-turnout cycles, with traders assigning the highest probability to the 4.6-4.8 million bracket amid steady early voting trends.