The closely matched probabilities across turnout ranges centered on 2.65M–2.95M reflect trader assessments of a low-competition midterm Senate race in a safely Democratic state. Incumbent Ed Markey secured the Democratic nomination over Seth Moulton in the September 1 primary with limited statewide enthusiasm, consistent with Secretary of State William Galvin’s assessment that the contest would not generate elevated participation. Historical patterns show midterm drop-off from presidential-year levels near 3.5 million votes, with 2022 producing roughly 2.51 million ballots. Early and mail voting volumes, along with typical unenrolled voter abstention, continue to anchor expectations near recent midterm benchmarks while leaving room for modest shifts based on get-out-the-vote efforts or national conditions ahead of November 3.