Incumbent Sen. Ed Markey’s strong polling lead and broad institutional backing anchor trader consensus in the Massachusetts Democratic Senate primary, scheduled for September 1. Recent UMass/WCVB surveys show Markey ahead by roughly 28–33 points, driven by voter emphasis on experience and trust, while Rep. Seth Moulton’s campaign has struggled to close the gap despite focusing on generational turnover and congressional age limits. High-profile endorsements from Sens. Elizabeth Warren and Bernie Sanders, Reps. Ayanna Pressley and Alexandria Ocasio-Cortez, plus coordinated advertising, have reinforced Markey’s position among Democratic primary voters. Minor candidates such as Alexander Rikleen register negligible support. A sudden late scandal or health development could theoretically alter the outcome before primary day, though current evidence indicates limited room for such shifts.