2026 Massachusetts Primaries

The story so far

As of September 2, 2026

Massachusetts held its state primaries on Sept. 1. The headline result is in the Democratic race for U.S. Senate, where Senator Ed Markey, 81, defeated Representative Seth Moulton, 47. That sets up a November contest between Markey and Republican attorney John Deaton. Republicans also voted for a gubernatorial nominee to face Governor Maura Healey, and voters weighed crowded contests for U.S. House seats, including the open Sixth District created by Moulton’s run.

This race tested whether Democratic voters would prioritize a call for younger leadership over a long progressive record, and the outcome shows they did not. Markey, a fixture of the party’s left who had backing from prominent progressives, kept his footing despite Moulton’s bid to make age and technological fluency central issues. An exchange in the final debate over artificial intelligence gave Moulton a clear contrast, but it did not alter the balance. In a primary season that has seen some Democratic incumbents lose elsewhere, Massachusetts kept an octogenarian progressive on the ballot.

The electorate helps explain why these choices matter now. About two-thirds of registered voters in Massachusetts are unenrolled in a party, while Democrats account for roughly 24 percent and Republicans less than 8 percent. In this environment, Democratic primaries often determine who will ultimately represent the state. Turnout was front‑loaded: before Election Day, roughly 464,600 Democratic ballots and 91,000 Republican ballots had already been cast early or by mail, so how those votes are handled is as consequential as who shows up on the day.

Election administration is under fresh scrutiny just as these results move into the general election phase. A Postal Service insider has alleged that a new ballot screening system was rushed into use and that a zero‑tolerance rule for barcode mismatches could hold back entire mailings if a single sample fails, raising the risk that valid ballots are delayed or rejected. The Justice Department stationed monitors in Boston, New Bedford, and Lowell to observe voting procedures. With many Massachusetts voters relying on early and mail voting, the immediate stakes are whether ballots already cast are processed and counted without avoidable errors.