Koh secures Democratic nomination for Massachusetts House seat vacated by Moulton
Daniel Koh, a former Biden administration official, won the Democratic primary for the 6th Congressional District, leading state Rep. Tram Nguyen by 10 points with 68 percent of votes counted. Koh had endorsements from Biden, Harris, and Buttigieg. He will face Republican Micah Jones in the general election.
Koh's victory marks a comeback after his 2018 loss in the neighboring 3rd District, where he was defeated by Rep. Lori Trahan. His political resume includes serving as chief of staff to Boston Mayor Marty Walsh, a role he continued when Walsh became Labor Secretary, before moving to the White House Office of Intergovernmental Affairs under Biden.
The primary was competitive, with Nguyen drawing support from prominent Massachusetts Democrats including Reps. Trahan and Ayanna Pressley, as well as The Boston Globe. Four other candidates appeared on the ballot, including Mariah Lancaster, who dropped out over the weekend and endorsed Nguyen. Koh now faces Republican Micah Jones, an Army veteran and lawyer, in the general election for the safely Democratic district.
This primary outcome could signal how Democratic voters weigh establishment credentials against progressive grassroots support in open-seat races. Koh's high-profile endorsements may reflect the party's preference for experienced operatives, while Nguyen's backing from progressive figures suggests an ongoing ideological tension. The general election is unlikely to shift the district's partisan balance, but the race could influence how future candidates approach fundraising, endorsements, and coalition-building in Massachusetts and similar blue districts nationwide.