Overview
- Ed Markey won the Democratic Senate primary by a wide margin, with returns showing roughly 65 percent to 35 percent for his challenger Seth Moulton on Sept. 1, and he is heavily favored to beat Republican John Deaton in November.
- Markey built his campaign on a left‑of‑center agenda and explicit support for transgender rights, a stance that helped rally labor groups, climate activists and high‑profile endorsers such as Alexandria Ocasio‑Cortez, Bernie Sanders and Elizabeth Warren.
- Moulton conceded after the loss, called for party unity and said he would back the Democratic nominee for the fall, even though his campaign had focused on age and tech competency as arguments for generational change.
- Longtime House Democrats Stephen Lynch and Richard Neal also won their primaries, and former Biden aide Dan Koh led the field to win the open 6th District nomination, keeping Massachusetts’ Democratic delegation largely intact.
- The Sept. 1 results undercut a broader 2026 trend of younger insurgents ousting veteran Democrats by showing that organized progressive coalitions, endorsements and issue alignment can preserve incumbents in deep‑blue states.