Massachusetts 5th — House 2026 Dem Primary
The Massachusetts 5th — House dem primary is scheduled for September 1, 2026. The model makes Katherine Clark the heavy favorite at 94%, with Jonathan Paz at 3% in a 3-candidate field. Katherine Clark is the incumbent and leads the field in reported fundraising and Jonathan Paz has the most tracked endorsements. No public polling is available for this race, so the forecast leans on fundraising, endorsements, candidate profiles, and historical results.
Current win probabilities
- Katherine Clark (incumbent) — 94%
- Jonathan Paz — 3%
- Tarik Samman — 3%
Probabilities update daily from polls, fundraising, endorsements, and historical results.