Sen. Ed Markey Wins Massachusetts Democratic Primary Over Rep. Seth Moulton
Markey's primary victory secures the Democratic Senate nomination in Massachusetts, setting up a general election contest in a state Democrats have held continuously since 1979.
Incumbent Sen. Ed Markey defeated Rep. Seth Moulton in the Massachusetts Democratic U.S. Senate primary on September 1, 2026, according to RealClearPolitics. Markey will represent the Democratic Party in the November 2026 general election.
Markey, first elected to the Senate in a 2013 special election and re-elected in 2014 and 2020, has held his current seat since defeating then-Rep. Stephen Lynch in a 2013 Democratic primary following John Kerry's departure to serve as Secretary of State. His 2020 primary victory over Rep. Joseph Kennedy III, by a margin of approximately 10 percentage points according to Massachusetts Secretary of State certified results, established him as a durable primary competitor despite facing well-funded challengers.
Moulton, who represents Massachusetts' 6th Congressional District and was first elected to the House in 2014, mounted the primary challenge. Moulton ran a brief 2020 presidential campaign before withdrawing in 2019. His congressional voting record and FEC filings for the 2026 cycle are available through the Federal Election Commission's public database at FEC.gov, where donors, expenditures, and loan activity for both candidates' campaigns are disclosed.
The Massachusetts Senate seat has been held by a Democrat without interruption since 1979, when Paul Tsongas succeeded Edward Brooke, the last Republican to hold the seat. The state last elected a Republican senator in 1972, according to Senate historical records maintained by the U.S. Senate Historical Office.
Markey, age 79 at the time of the primary, had faced questions about age and generational change within the Democratic Party, themes that also shaped the 2020 primary in which Kennedy framed his challenge partly around the need for new leadership. Moulton, age 47, similarly emphasized a generational argument in the 2026 race, according to campaign statements reported by Massachusetts news outlets.
Markey serves on the Senate Commerce, Science, and Transportation Committee and the Senate Foreign Relations Committee, according to the Senate's official committee assignment records. He is the co-author, with Rep. Alexandria Ocasio-Cortez (D-NY), of the Green New Deal resolution introduced in February 2019 (S.Res.59, 116th Congress), a policy record that figured in both his 2020 and 2026 primary contests.
Moulton's campaign committee filings, including total receipts, expenditures, and cash on hand through the reporting period closest to the primary date, are available through FEC.gov under his registered committee. Markey's corresponding filings are similarly available. The specific fundraising totals for each candidate's 2026 Senate race filings were not available in the source material reviewed for this report.
The November 2026 general election opponent for Markey has not been identified in the source material reviewed. The Massachusetts Republican Party's Senate nominee, if one has been selected, and that candidate's FEC filings, would be the relevant public records to determine the full general election field.
What remains unknown from available source material includes the vote margin between Markey and Moulton, county-level results, and total primary turnout. The Massachusetts Secretary of State's official certified results, once published at sec.state.ma.us, would provide the complete precinct-level vote totals and the certified margin of victory.