Massachusetts 3rd District
Currently held by a Democrat · incumbent running
- Projected margin
- D+36.4
- 80% range
- D+24.9 to D+48.0
- Partisan lean
- D+21.9
- Uncertainty multiplier
- 1.80×
The 80% range comes from 200,000 simulations in which this race’s error is correlated with every other race through the national, state and demographic layers.
- Polling average
- no polls
- Fundamentals
- D+36.6
- Blended
- D+36.6
- Similar-race shift
- −2.3
No public polling of this matchup. The forecast rests on fundamentals plus the polling residuals of demographically and politically similar races — which is the normal case: most of the 435 House seats are never polled.
- Partisan lean
- D+21.9
- Elasticity
- 1.11
- Incumbency
- +3.4
- Candidate experience
- 0.0
- Fundraising
- +4.1
- National environment
- D+7.1
- Expected margin
- D+38.9
- 2024 margin
- D+19.4
- 2020 margin
- D+28.0
- Shift 2020 → 2024
- R+8.6
- Votes cast, 2024
- 358,902
Presidential results reaggregated onto the 2026 district lines. This is where the seat’s partisan lean comes from, and it carries most of the forecast in a race nobody has polled.
- Population
- 611,501
- Median age
- 48.8
- Median household income
- $93,400
- Bachelor’s degree or higher
- 38%
- White
- 64%
- Black
- 6%
- Hispanic
- 19%
- Asian
- 9%
Used to find demographically similar districts, so a race with no polling can borrow the polling error of races that look like it.
| Candidate | Party | Raised | Cash on hand |
|---|---|---|---|
| Lori Trahan | DEM | $1.6M | $1.8M |
| Gary J. Grossi | REP | $7k | $6k |
Receipts across the cycle, from FEC bulk filings. The model uses the ratio between the two sides rather than either total, and weights it lightly — money follows a competitive race at least as much as it causes one.