Massachusetts 6th — House 2026 Dem Primary

The Massachusetts 6th — House dem primary is scheduled for September 1, 2026. The model favors Daniel Koh at 60%, ahead of John Beccia at 28% in a 7-candidate field. Daniel Koh leads the field in reported fundraising and has the most tracked endorsements. Public polling is available for this race and feeds the forecast alongside fundraising, endorsements, and historical results.

Current win probabilities

1. Daniel Koh — 60%
2. John Beccia — 28%
3. Tram Nguyen — 5%
4. Jamie Belsito — 2%
5. Mariah Lancaster — 2%
6. Beth Andres-Beck — 2%
7. Rachel Creemers — 2%

Probabilities update daily from polls, fundraising, endorsements, and historical results. Last updated September 11, 2026.

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