Incumbent Ed Markey holds a commanding position in the Massachusetts Democratic Senate primary as voters weigh his decades of congressional service against Rep. Seth Moulton's challenge as a younger alternative focused on generational change. Recent Emerson College polling shows Markey ahead 37% to 32%, narrowing from earlier double-digit margins, with nearly 30% of likely primary voters still undecided ahead of the September 1 contest. Moulton's endorsements from groups like VoteVets and the Massachusetts Teamsters have boosted his visibility, yet Markey's established base among Democratic voters continues to anchor trader consensus at 71.5%. Minor candidates including Alexander Rikleen and Ayanna Pressley register negligible support in surveys, underscoring the race's focus on the two leading contenders.