Ed Markey secured the Democratic nomination for U.S. Senate in Massachusetts on September 1, 2026, defeating Rep. Seth Moulton by a wide margin in a contest centered on progressive policy alignment versus calls for generational turnover. The incumbent emphasized his long record on the Green New Deal, Medicare for All, and transgender rights, bolstered by endorsements from Sens. Elizabeth Warren and Bernie Sanders along with Reps. Alexandria Ocasio-Cortez and Ayanna Pressley. Moulton positioned himself as a fresher alternative but faced headwinds over prior moderate stances, including comments on transgender athletes. In the heavily Democratic state, the primary outcome reflects trader consensus on the strength of Markey’s ideological positioning and institutional support ahead of the November general election.