2026 forecast · Massachusetts 4th

Jake Auchincloss is all but certain to win Massachusetts's 4th District.

Jake Auchincloss vs Thomas Stalcup. The model has Auchincloss ahead by 40.7 points, winning 100 percent of 2,000 simulated elections.

Safe DModel D +40.7Updated October 22, 2026
Jake Auchincloss
Democrat
70.4%
226,570 projected votes
Thomas Stalcup
Republican
29.6%
95,449 projected votes
100%Auchincloss
0%Stalcup
Auchincloss all but certainEach square is one simulated election night, Auchincloss wins about 100 of 100
RatingSafe D100% chance for Auchincloss
Model marginD +40.7No polls in the race
80 percent rangeD +48.0 to D +33.12,000 simulations
Projected votes322,019Auchincloss 70.4%

The district map

Every district in the state, shaded by its rating

Massachusetts districts

9 districts
Safe DLikely DLean DToss upLean RLikely RSafe R

Vote share

Each candidate's projected share and the range of 80 percent of simulations

Jake AuchinclossDemocrat · 100% to win
70.4%
Thomas StalcupRepublican · 0% to win
29.6%

Scale runs from 25 to 75 percent. The dot is the forecast, the band is the 80 percent range and the brighter tick marks 50 percent.

Projected district vote

322,019 votes
CandidateVotesShare
Jake Auchincloss D226,57070.4%
Thomas Stalcup R95,44929.6%
Total322,019100%

Each candidate's expected vote in the On Point simulation, at the forecast's projected turnout.

The trend

Each side's chance of winning over the forecast's recent updates

0%25%50%75%100%100% Auchincloss0% Stalcup15 updates agoToday

Polling

Every poll in the average, and how the model reads it

The Massachusetts governor polling average
25%30%35%40%45%50%55%60%65%JulAugSepOct55.9Healey33.9Minogue
The line is the On Point average: a robust LOWESS fit through the polls, weighted by recency, sample, voter screen and pollster grade, refit three times so outliers count for lessDot size is each poll's weight todayHover or use the arrow keys to read any day
What moves the average today
UMass Amherst / YouGovAug 12 · 800 RV · C18%Healey +20.0
MassINC Polling Group for CommonWealth BeaconSep 22 · 800 LV · B17%Healey +22.0
UMass Amherst/WCVB/YouGovOct 12 · 800 RV · C17%Healey +25.0
University of New HampshireAug 24 · 881 LV · C-17%Healey +24.0
Suffolk University/Boston GlobeOct 18 · 500 LV · B+15%Healey +22.6
University of New HampshireSep 21 · 564 LV · C-15%Healey +16.0
Every other poll together: 0.9%

This is the same On Point polling average as the full average page. The forecast reads the polls through its own Election Day projection, shown as the On Point average in the table below, and blends it with partisan lean and fundamentals.

Polls of the race

Full average
PollsterSampleAgeMargin
On Point averageWeighted averageNo polls

Each margin is the poll as the pollster published it. The forecast counts every poll after its house effect and the undecided split, which is what the trail above shows; hover a margin for the counted value. Lean R and Lean D mark partisan leaning firms.

Model margin
Auchincloss +40.7
Chance of winning
Jake Auchincloss100%
Thomas Stalcup0%
Simulated vote
Jake Auchincloss70.4%
Thomas Stalcup29.6%
How the model gets there
Partisan leanR +20.0
FundamentalsD +40.6
With pollsD +40.4
Early vote turnoutD +0.3
With early voteD +40.7

Massachusetts has no early vote reported yet, so its turnout correction comes from similar states that do and from its primary turnout. Early vote tracker

How we got here

From the state's partisan lean to the forecast, one stage at a time

D +49R +49Partisan leanthe state's baselineR +20.0Fundamentalsapproval, economy, candidatesD +40.6With pollsno pollsD +40.4With early voteturnout so farD +40.7
Methodology
Every county is rebuilt by simulating voters going to the polls, 2,000 times, from On Point Polling survey data, past results, and the polling average. How the model works.