The uncompetitive Massachusetts Senate race between incumbent Democrat Ed Markey and Republican John Deaton has produced closely matched Polymarket bins centered on 2.5M–2.8M total votes, reflecting trader uncertainty over typical midterm turnout patterns in a safely Democratic state. Recent polling averages show Markey leading by 25–30 points, limiting voter enthusiasm and campaign intensity ahead of the November 3 election. A lopsided Democratic primary against Seth Moulton generated limited participation, consistent with Secretary of State observations that it will not boost overall engagement. Early voting volumes, mail ballot returns, and historical midterm drop-off continue to anchor assessments around 2.6M–2.8M. Weather on Election Day, last-minute get-out-the-vote efforts, or shifts in independent and third-party support could widen separation among the leading ranges.