Incumbent Ed Markey holds a strong position in the September 1 Democratic primary for Massachusetts Senate, backed by endorsements from figures like Senator Elizabeth Warren and Representative Ayanna Pressley, plus major labor unions. His long tenure and name recognition among Democratic voters contribute to trader consensus favoring him at 77%. Representative Seth Moulton’s challenge emphasizes generational change and congressional age limits, with recent Emerson College polling in early May showing a narrower 37-32% lead for Markey amid 29% undecided voters. Minor candidates Alexander Rikleen and Ayanna Pressley register negligible support. The race has remained relatively low-profile, though campaigns are expected to intensify outreach ahead of the primary.