Massachusetts 9th District
Currently held by a Democrat · incumbent running
- Projected margin
- D+22.9
- 80% range
- D+11.4 to D+34.4
- Partisan lean
- D+13.2
- Tipping-point chance
- 0.11%
- 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+23.1
- Blended
- D+23.1
- Similar-race shift
- −2.4
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+13.2
- Elasticity
- 1.08
- Incumbency
- +3.4
- Candidate experience
- 0.0
- Fundraising
- +0.8
- National environment
- D+7.1
- Expected margin
- D+25.5
- 2024 margin
- D+10.9
- 2020 margin
- D+18.5
- Shift 2020 → 2024
- R+7.6
- Votes cast, 2024
- 460,119
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
- 638,761
- Median age
- 54.4
- Median household income
- $93,600
- Bachelor’s degree or higher
- 41%
- White
- 85%
- Black
- 5%
- Hispanic
- 5%
- Asian
- 2%
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 |
|---|---|---|---|
| William R Keating | DEM | $422k | $496k |
| Robert Tyler Macallister | REP | $175k | $35k |
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.