Massachusetts 6th — House 2026 Dem Primary

The Massachusetts 6th — House dem primary is scheduled for September 1, 2026. The model makes Daniel Koh the clear favorite at 79%, ahead of John Beccia at 6% 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 — 79%
2. John Beccia — 6%
3. Tram Nguyen — 4%
4. Jamie Belsito — 3%
5. Mariah Lancaster — 3%
6. Beth Andres-Beck — 3%
7. Rachel Creemers — 3%

Probabilities update daily from polls, fundraising, endorsements, and historical results. Last updated July 23, 2026.

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