Gary Grossi
Republican
U.S. House · All Massachusetts races
Massachusetts District 3
Solid D
Lori Trahan
Democratic · incumbent
100 in 100
chance of winning, out of 100
Gary Grossi
Republican
0 in 100
Lori Trahan wins in 100 of 100 simulations.
There are no qualifying public polls yet, so the forecast leans on fundamentals; partisan lean, the national environment and incumbency point to Lori Trahan +35.3.
Where the result could land
Every simulated outcome, grouped in 2-point steps. Projected margin Trahan +35.3; 80 in 100 fall between Trahan +28.0 and Trahan +42.6.
The candidates
No biography on file yet.
Lori TrahanIncumbent
Democratic
Dennis Conlon
Independent
Ballot list and short bios from Wikipedia (CC BY-SA); websites from Wikidata.
What if this race flips? Try it in the map builder →
Polls
No public polls have tested Lori Trahan against Gary Grossi yet.
No polls of this matchup yet, so there is no polling average. The forecast relies on fundamentals.
Chance of winning over time
How this race’s odds have moved as polls and the national environment changed.
Out of 100. Today: Trahan 100, Grossi 0.
What’s driving the forecast
The model blends each estimate by how much to trust it right now. Polls get 0% of the weight, 15 days out.
| Polling average (after adjustments) | — | no polls |
| Partisan lean (Cook PVI, 2026 lines) | D+11.0 | roughly 22 points of margin vs. the nation |
| National environment | D+9.6 | generic ballot + presidential approval |
| Incumbency | Trahan +3.6 | incumbent’s side |
| Fundamentals estimate | Trahan +35.3 | ±6 typical error |
| Expert ratings (average) | — | used only in the “+ Expert ratings” version |
| Forecast | Trahan +35.3 | ±5.7 standard deviation, including 2.3 for movement before Election Day |
All three versions
- Polls only: Lori Trahan 100 in 100 (Solid D)
- Polls + fundamentals: Lori Trahan 100 in 100 (Solid D)
- Polls + fundamentals + experts: Lori Trahan 100 in 100 (Solid D)
Rules and notes
- Incumbent renominated
House races, closest first · this is #326 of 421