# Massachusetts Democratic Senate primary results > Live situation record from CLSTR: https://clstr.news/situations/massachusetts-democratic-senate-primary-contest > Updated: 2026-09-02T09:27:14.000Z. Sources: 59. Developments: 7. In the September 1, 2026, Democratic primary election, incumbent Senator Ed Markey, 80, secured a decisive victory to advance to the general election. Markey defeated U.S. Representative Seth Moulton, 47, with approximately 64% to 65% of the vote. The contest served as a significant ideological and generational clash. Moulton had campaigned on the necessity of new leadership, specifically criticizing Markey’s grasp of modern technology and artificial intelligence. Markey, supported by progressive leaders like Senator Bernie Sanders, Senator Elizabeth Warren, and Representative Alexandria Ocasio-Cortez, successfully defended his record on climate change and healthcare. A central theme of the race was the divide over transgender rights. Markey, a long-time progressive, campaigned on his support for transgender athletes and his authorship of a Transgender Bill of Rights. He used Moulton’s previous comments regarding biological sex in women’s sports to argue that Moulton was out of touch with the state’s progressive electorate. Markey’s win was part of a broader trend in Massachusetts where veteran Democratic incumbents successfully defended their seats. Similar victories were seen in U.S. House races, including Representative Stephen Lynch, 71, defeating Patrick Roath in the 8th District, and Representative Richard Neal, 77, defeating Jeromie Whalen in the 1st District. Following this primary win, Markey is set to face Republican candidate John Deaton in the November general election. Given Massachusetts' status as a Democratic stronghold, Markey is widely expected to secure a third full term in the Senate. ## Claims - Ed Markey defeated Seth Moulton in the Massachusetts Democratic Senate primary. (corroborated by 4 sources) - U.S. Rep. Seth Moulton is challenging U.S. Sen. Edward Markey in the Massachusetts Democratic primary. (corroborated by 3 sources) - Edward Markey is 80 years old. (corroborated by 3 sources) - Senator Ed Markey is 80 years old. (corroborated by 3 sources) - Representative Seth Moulton is 47 years old and a six-term congressman. (corroborated by 3 sources) - The Democratic Senate primary is being held in Massachusetts. (corroborated by 3 sources) - Senator Ed Markey is pitching himself as an anti-establishment candidate focused on left-wing ideals. (corroborated by 3 sources) - Representative Seth Moulton is basing his campaign on the theme of generational change. (corroborated by 3 sources) - Markey received endorsements from the High School Democrats of America and the College Democrats of America. (corroborated by 2 sources) - The Democratic primary election in Massachusetts is scheduled for Tuesday, Sept. 1. (corroborated by 2 sources) - Markey received endorsements from Bernie Sanders, Elizabeth Warren, Alexandria Ocasio-Cortez, and Ayanna Pressley. (corroborated by 2 sources) - Several Democratic incumbents over age 70, including Shri Thanedar, John Larson, and Adriano Espaillat, lost their primary races to younger candidates. (corroborated by 2 sources) ## Timeline ### 2026-09-02: Ed Markey wins Massachusetts Democratic Senate primary Senator Ed Markey, 80, defeated Representative Seth Moulton in the Massachusetts Democratic Senate primary, fending off a generational challenge and a push for more moderate leadership. 14 sources. https://clstr.news/cluster/ed-markey-defeats-seth-moulton-in-massachusetts-democratic-primary ### 2026-08-31: Ed Markey wins Massachusetts Democratic Senate primary Massachusetts Senator Ed Markey, 80, won the Democratic primary against challenger Seth Moulton, 47, defeating a campaign centered on generational change to advance to the November general election. 33 sources. https://clstr.news/cluster/ed-markey-defeats-seth-moulton-in-massachusetts-democratic-senate-primary ### 2026-08-26: Massachusetts Democratic primaries see shifting poll leads and tax disputes Massachusetts Democratic primaries face shifting dynamics as Senator Ed Markey extends his lead in polls, while local candidates debate tax assessment disputes in the First Suffolk District. 5 sources. https://clstr.news/cluster/massachusetts-democratic-primaries-see-shifting-poll-leads-and-tax-disputes ### 2026-08-25: Massachusetts early voting continues ahead of September 1 primary Early voting is active across Massachusetts for the September 1 primary, featuring a competitive Democratic U.S. Senate contest between Ed Markey and Seth Moulton. 2 sources. https://clstr.news/cluster/massachusetts-early-voting-continues-ahead-of-september-1-primary ### 2026-08-20: Ed Markey and Seth Moulton hold final debate before Massachusetts primary Senators Ed Markey and Seth Moulton held their final debate before the Massachusetts Democratic primary, clashing over age, energy costs, and social issues as Markey received an endorsement from Alexandria Ocas 9 sources. https://clstr.news/cluster/ed-markey-and-seth-moulton-face-off-in-massachusetts-senate-primary ### 2026-08-17: Ed Markey leads Seth Moulton in Massachusetts Democratic Senate primary poll Senator Ed Markey leads Representative Seth Moulton in a Massachusetts Democratic Senate primary poll, with 60% support compared to Moulton's 32%. The candidates differ on progressivism and foreign policy. 2 sources. https://clstr.news/cluster/ed-markey-leads-seth-moulton-in-massachusetts-democratic-senate-primary-poll ### 2026-07-25: Massachusetts Senate Primary Pits Seth Moulton Against Ed Markey Seth Moulton challenges long‑time incumbent Ed Markey in the Massachusetts Democratic Senate primary, highlighting a generational clash and gaining endorsement from Hampden DA Anthony Gulluni. 7 sources. https://clstr.news/cluster/massachusetts-senate-primary-pits-seth-moulton-against-ed-markey --- Cite as: Massachusetts Democratic Senate primary results. CLSTR, https://clstr.news/situations/massachusetts-democratic-senate-primary-contest