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U.S. House · All Massachusetts races

Massachusetts District 9

Solid D
Compare
Bill Keating
Democratic · incumbent
>99 in 100
50–50chance of winning, out of 100
Tyler MacAllister
Republican
<1 in 100

Bill Keating wins in >99 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 Bill Keating +24.7.

Where the result could land

Every simulated outcome, grouped in 2-point steps. Projected margin Keating +24.7; 80 in 100 fall between Keating +17.4 and Keating +32.0.

MacAllister +30MacAllister +20MacAllister +10Keating +10Keating +20Keating +30Tie

The candidates

Bill KeatingIncumbent
Democratic
No biography on file yet.
Tyler MacAllister
Republican
No biography on file yet.

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 Bill Keating against Tyler MacAllister 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.

No change over the past 3 months
020406080100Aug 1Sep 1Oct 1

Out of 100. Today: Keating 100, MacAllister 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+6.0roughly 12 points of margin vs. the nation
National environment D+9.6generic ballot + presidential approval
Incumbent’s track record MacAllister +0.6In 2024 they ran 1.2 pts more Republican than the state’s lean predicted; half carries over (max 10)
IncumbencyKeating +3.6incumbent’s side
Fundamentals estimateKeating +24.7±6 typical error
Expert ratings (average)—used only in the “+ Expert ratings” version
ForecastKeating +24.7±5.7 standard deviation, including 2.3 for movement before Election Day

All three versions

  • Polls only: Bill Keating >99 in 100 (Solid D)
  • Polls + fundamentals: Bill Keating >99 in 100 (Solid D)
  • Polls + fundamentals + experts: Bill Keating >99 in 100 (Solid D)

Rules and notes

  • Incumbent renominated

House races, closest first · this is #231 of 421