Recent Democratic primary turnout in Illinois rose notably above 2022 levels amid a competitive Senate contest, reflecting stronger base engagement that traders see as supporting mid-4 million total votes in the November general. As a midterm in a solidly Democratic state following an open-seat primary, expected participation sits between historical midterm averages and elevated enthusiasm patterns, with Cook County and suburban mobilization as key variables. The near-even split between the 4M-4.25M and 4.25M-4.5M ranges captures uncertainty over whether national referendum dynamics and Democratic organizational efforts will push totals toward the higher end or settle closer to typical off-year figures. Late shifts in early voting data, get-out-the-vote intensity, or weather could widen separation between those leading bins.