Maine Senate 2026 Dem Primary
The Maine Senate dem primary is scheduled for June 9, 2026. The model makes Graham Platner the heavy favorite at 94%, with David Costello at 3% in a 3-candidate field. Graham Platner leads the field in reported fundraising and 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
- Graham Platner — 94%
- David Costello — 3%
- Andrea LaFlamme — 3%
Probabilities update daily from polls, fundraising, endorsements, and historical results.