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Koh, Jones vie for open congressional seat
Daniel Arrigg Koh, 41, the Democratic nominee, his background (born in Andover; son of Howard Koh, former Obama administration health official; mother Claudia Arrigg, an ophthalmologist).
Updated Oct 16, 2026, 2:28 PM ET
Dan Koh, a Democrat who served as deputy director of the White House Office of Intergovernmental Affairs, is his party's nominee for Massachusetts's open 6th district seat in 2026 against Republican Micah Jones.
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Live TruthIndex™ and prediction market consensus for races contested by Dan Koh.
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Recent media coverage for Dan Koh.
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Tewksbury 2026 Election Voter Guide: Candidates, Polling Places, Early Voting Details
The voter registration deadline is Saturday, Oct. 24. Online registration is available until 11:59 p.m.
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"Je trouve ça dommage" : Claude Dartois agacé par les nouvelles règles de Koh-Lanta All Stars, il monte une nouvelle fois au créneau
Claude Dartois critique vivement les nouvelles règles de Koh-Lanta All Stars. Dans l’édition All Stars 2026, des aventuriers éliminés peuvent regagner le jeu (une ou deux fois).
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"Koh-Lanta, c’est aussi un jeu d’alliances et de stratégie" : Freddy Boucher fait une mise au point après l’élimination de Yassin
The article discusses Freddy Boucher’s response following Yassin’s elimination on Koh-Lanta, framing the show as a game of alliances and strategy.
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Andover candidates vie for open State House seat before Oct. 17 voting
Dan Koh: The article references that Dan Koh, a candidate in Massachusetts’s 6th District congressional race, has a leadership PAC that plans to support Murray and other state legislative Democrats in competitive…
No story this week names this candidate.
- Born
- January 1, 1985
- Education
- Phillips Academy
Harvard University (Bachelor of Arts)
Harvard Business School (Master of Business Administration)
Biography & Campaign Analysis
Background
Dan Koh was born on January 1, 1985, to doctors Howard K. Koh and Claudia A. Arrigg, the middle of three children; his father later served as U.S. Assistant Secretary for Health under President Barack Obama.
His uncle, Harold Hongju Koh, was dean of Yale Law School and Legal Adviser of the Department of State. Koh graduated from Phillips Academy, earned a Bachelor of Arts from Harvard University and received a Master of Business Administration from Harvard Business School.
He is married to Amy Sennett, a lecturer in law at Columbia Law School, and the couple have two children.
Career
After a stint as chief of staff to Arianna Huffington, Koh became chief of staff to Boston Mayor Marty Walsh at the age of 29.
He left the Walsh administration to run in the 2018 Democratic primary for Massachusetts's 3rd congressional district, which he lost to Lori Trahan by 145 votes, receiving 18,435 votes to her 18,580.
In 2019 he was elected to the Andover Board of Selectmen with 2,733 votes, more than any other candidate, and he resigned in February 2021 to join the Biden administration.
In 2021 Walsh, by then U.S. Secretary of Labor, named Koh as his chief of staff. Koh later served as Special Assistant to the President and Deputy Cabinet Secretary at the White House, and he concluded his service as Deputy Assistant to the President and deputy director of the White House Office of Intergovernmental Affairs, a post he held from 2022 to 2025.
2026 race
The 6th district covers northeastern Massachusetts, including Salem, Peabody and Gloucester, and its seat is open because Democratic incumbent Seth Moulton declared his candidacy for the U.S. Senate against incumbent Senator Ed Markey. Koh announced his campaign for the seat in October 2025.
He won the Democratic primary on September 1, 2026, with 40.9% of the vote, ahead of state representative Tram Nguyen with 29.4%, lawyer and business executive John Beccia with 12.2% and Topsfield Town Moderator Jamie Belsito with 9.6%.
In the general election on November 3, 2026, he faces Republican Micah Jones, an attorney and U.S. Army veteran.