Daniel Koh, a former official in the Biden administration, has won the Democratic primary for the seat representing Massachusetts' 6th Congressional District. The seat is currently held by Representative Seth Moulton, who is not seeking reelection. Koh’s victory comes after a closely contested race against state Representative Tram Nguyen, a progressive candidate who sought to challenge Koh for the party’s nomination.

According to projections from Decision Desk HQ, Koh managed to secure the necessary support to move forward to the general election. The primary race highlighted a divide within the district’s Democratic base, pitting Koh’s background as a former administration official against Nguyen’s legislative record at the state level. While the race was characterized as a "tough primary battle," the results confirm that Koh will now represent the Democratic Party in the upcoming general election for the district. Representative Moulton, who has held the seat for several terms, has not yet publicly commented on the specific dynamics of the primary outcome beyond the transition of his office.