Incumbent Sen. Ed Markey holds a strong lead in the September 1 Democratic primary due to his established position, endorsements from Sens. Elizabeth Warren and Bernie Sanders plus Rep. Ayanna Pressley, and a campaign emphasizing continuity on progressive priorities. Rep. Seth Moulton’s challenge has centered on calls for generational turnover and age limits for Congress, drawing some attention through multiple debates that featured sharp exchanges on spending, housing, and immigration enforcement. Minor candidates including Rep. Ayanna Pressley and Alexander Rikleen remain negligible factors. Polling has shown a competitive but narrowing contest at times, yet trader consensus reflected in current odds aligns with Markey’s structural advantages as the sitting senator heading into the final weeks before the primary.