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Former Biden Aide Wins Massachusetts Democratic House Primary
Confirmed
In Short: Dan Koh, a former Biden White House aide, secured the Democratic nomination for Massachusetts' 6th Congressional District, outpacing Rep. Seth Moulton in the primary.

In a surprising turn, Dan Koh, a former Biden White House aide, has emerged victorious in the Democratic primary for Massachusetts' 6th Congressional District, defeating Rep. Seth Moulton. Koh capitalized on strong endorsements from former President Joe Biden and Vice President Kamala Harris, as well as support from other Biden administration officials like former Labor Secretary Marty Walsh, his former boss. His campaign strategy included a robust fundraising effort, significantly out-raising his opponents in the five-way primary.
Koh's success contrasts with the broader trend among Democratic candidates who are maintaining a distance from the previous administration. However, in this safe blue seat, he embraced the Biden legacy, a move that resonated with voters. This primary win positions Koh to potentially challenge Sen. Ed Markey in the general election, who has now secured the Democratic nomination for U.S. Senate after defeating Rep. Joe Kennedy III in 2020.
Koh's campaign strategy was particularly notable for its focus on Biden's support, featuring the former president and vice president in campaign ads. This approach, while uncommon among Democratic candidates, proved effective in a primary where younger representation was a key issue. His front-runner status was cemented by his fundraising prowess, which set him apart from his opponents in the race.
Background
Massachusetts, officially the Commonwealth of Massachusetts, is a state in the New England region of the Northeastern United States. It borders the Atlantic Ocean and the Gulf of Maine to its east, Connecticut and Rhode Island to its south, New Hampshire and Vermont to its north, and New York to its west.
What's confirmed
What's still developing
- Sen. Ed Markey has won the Democratic nomination for U.S. Senate in Massachusetts, according to a race call by The Associated Press, repelling a challenge from Rep. Seth Moulton.
- In 2020, Markey defeated Rep. Joe Kennedy III who also argued that Massachusetts needed younger representation.
- UNITED STATES - AUGUST 15: Dan Koh, a candidate for Massachusetts' 6th Congressional District, attends a "meet the candidates" event hosted by the Peabody Democratic City Committee in Peabody, Mass., on Saturday,…
- Seth Moulton in Massachusetts on Tuesday — by being one of the few Democrats on the campaign trail this cycle who explicitly embraced the former president.
- Koh ran hard on endorsements from both former President Joe Biden and former Vice President Kamala Harris, featuring the pair in a campaign ad at a time when most Democratic candidates are keeping their distance from…
- He also touted support from other Biden administration officials, including former Labor Secretary and past Boston Mayor Marty Walsh, his longtime boss.
- Koh emerged as a front-runner by vastly out-raising his opponents in the five-way primary for the 6th District seat Moulton vacated to run for Senate.
- Lori Trahan in 2018 in Massachusetts’ 3rd District.
