Seth Moulton

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Democrat Dan Koh is projected to win a U.S. House seat in the Mass. 6th Congressional District, filling the seat being vacated by Rep. Seth Moulton.

The Associated Press called the race for Koh around 10:30 p.m. Koh had received just over 62 percent of the vote, with around 14 percent of the votes counted.

Koh, a former White House senior aide during the Biden administration and chief of staff to Boston Mayor Marty Walsh, will replace Moulton, who served in the seat for six terms. Koh earned the democratic nomination in a crowded primary of six candidates.

Koh’s Republican opponent Micah Jones, an attorney and U.S. Army veteran, received around 37 percent of the vote.

The seat opened up when Moulton announced his plans to challenge Sen. Ed Markey last October. Moulton lost his bid for the senate seat in the Sept. 1 primary, earning around 35 percent of the votes.

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