Primary
Democratic Primary
Held September 1, 2026.
| Candidate | Votes | % | |
|---|---|---|---|
| Edward J. Markey ✓ | 265,423 | 67.4% | |
| Seth Moulton | 128,419 | 32.6% |
Republican Primary
Held September 1, 2026.
| Candidate | Votes | % | |
|---|---|---|---|
| John Deaton ✓ | 77,028 | 100.0% |
Nonpartisan Primary
Held September 1, 2026.
| Candidate | Votes | % | |
|---|---|---|---|
| Write-in | 576 | 0.7% |
Full calendar and every race: Massachusetts primary guide
Race Overview
General Election Polling Trend
PollingSource average — trailing average of all polls from the last 30 days.
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Candidates
General Election Polling Average
Average reflects all polls from the last 30 days; table shows the most recent 30 days or the newest 3 polls, whichever is more — subscribe for the full history. How accurate is each pollster? →
| Pollster | Date | Sample | MoE | Dem | Rep |
|---|---|---|---|---|---|
| UMass Amherst/YouGov | 2026-08-12 | 800 RV | ±4.40 | Ed Markey 51.00% | John Deaton 30.00% |
| University of New Hampshire | 2026-06-23 | 623 LV | ±3.80 | Ed Markey 50.00% | John Deaton 34.00% |
| University of New Hampshire | 2026-06-12 | 500 LV | ±4.40 | Ed Markey 55.00% | John Deaton 30.00% |
Questions About This Race
Who is winning the 2026 Massachusetts Senate race?
Ed Markey leads John Deaton 51% to 30% in the PollingSource polling average — a D+21.0 margin based on 1 poll from the last 30 days.
Is the 2026 Massachusetts Senate race competitive?
No — the expert consensus rates it Safe D for Democrats.
What does the latest poll of the 2026 Massachusetts Senate race say?
The most recent public poll, from UMass Amherst/YouGov (completed August 12, 2026), found Ed Markey (D) at 51% and John Deaton (R) at 30%.
When is the 2026 Massachusetts Senate race decided?
Election Day is Tuesday, November 3, 2026.
How is the PollingSource average calculated?
The PollingSource average is the unweighted mean of every scientific public poll of the race from the last 30 days — we do not exclude pollsters. Each race page lists the individual polls behind the average with pollster, field dates, sample size, and margin of error. Full details: pollingsource.com/methodology.
Race Notes
Long-tenured Senator
Independent Expenditures Updated just now
Top Spenders
- ADVANCE PROGRESS Mixed $5,594,939
- COMMONWEALTH TOGETHER PAC GOP-aligned $2,222,370
- NRDC ACTION VOTES Dem-aligned $25,000
- NATIONAL ASSOCIATION OF REALTORS POLITICAL ACTION COMMITTEE Dem-aligned $17,917
- GIVEGREEN UNITED ACTION Dem-aligned $80
- SIERRA CLUB INDEPENDENT ACTION Dem-aligned $10
Full outside-spending research — every committee, every race →