Tuesday’s Democratic primaries in Massachusetts are likely to determine who will represent the state in Washington next year. The state’s strong Democratic tilt makes its primary contests more decisive than general elections for congressional seats. The last Republican House members departed after 1996, and Scott Brown—elected to the Senate in a 2010 special election following Edward Kennedy’s death—remains the sole Republican senator from Massachusetts since 1979.
Democratic voters will again evaluate whether Senator Ed Markey’s age makes him unsuitable for another six‑year term. They will also decide the fate of Representative Stephen F. Lynch, the lone remaining House Democrat who opposed the Affordable Care Act. Meanwhile, Democrats north of Boston must choose between a candidate backed by former President Joseph R. Biden Jr. and his administration or a progressive state legislator.
Four pivotal issues will shape the outcome of Tuesday’s primary.
Will Massachusetts Democrats consider age a factor for Senator Ed Markey’s re‑election bid?
Six years after surviving a younger challenger, 80‑year‑old Markey faces another primary battle. He seeks to overcome Democratic concerns about aging candidates, especially after Biden’s withdrawal. His opponent, Representative Seth Moulton, 47, frames the race around generational change. Moulton’s critique gained traction when Markey struggled during a debate to name specific AI platforms he uses. Unlike Biden’s widely publicized debate performance or Representative John Larson’s mid‑speech freeze—which cost Larson his primary—Markey has avoided similar public senior moments.
Recent polls give Markey a comfortable lead. He continues to position himself as the progressive candidate, attacking Moulton’s remarks on transgender athletes and touting endorsements from Senators Bernie Sanders and Representatives Alexandria Ocasio‑Cortez. The primary winner will face Republican John Deaton, who captured 40 % of the vote against Senator Elizabeth Warren in 2024.
What are the prospects for Representative Seth Moulton in his primary challenge against Senator Ed Markey?
For the past dozen years, Representative Seth Moulton has been a fast‑moving figure in Democratic politics, seeking to unseat incumbents at every level.
In 2014 he defeated Representative John Tierney in a primary, and in 2018 he attempted to replace Representative Nancy Pelosi as House speaker but failed. He then launched a presidential campaign in 2020, exiting after four months without securing a debate spot.
Should his challenge to Senator Ed Markey fall short, Moulton plans to continue building his political network. As a Marine veteran, he leads “Serve America,” an organization that has recruited 23 members of Congress and 13 Democratic House nominees, claiming credit for flipping 24 seats from red to blue. “I’ve flipped 24 seats over the years from red to blue with my organization,” Moulton said in a recent interview. “There’s one person here trying to build majorities across the country in nearly everything I do.”
Can Representative Stephen F. Lynch maintain his seat amid challenges from younger, progressive candidates?
Representative Stephen F. Lynch, a 25‑year veteran of Congress, now faces a primary contest against a younger challenger, echoing his 2013 race against Senator Ed Markey.
Lynch, a self‑described moderate, stands out as the only House Democrat who voted against the Affordable Care Act in 2010. He identifies as “pro‑life” at a time when the party leans strongly pro‑abortion rights, and he supported funding for Trump administration immigration enforcement. These positions have been maintained despite representing a heavily Democratic South Boston district, where Lynch has consistently earned at least 65 % of the vote.
His opponent, Patrick Roath, a Boston attorney and former aide to ex‑Governor Deval Patrick, frames the race around generational change from a progressive perspective, criticizing Lynch’s health‑care and immigration stances to attract left‑leaning voters.
Which candidate is likely to succeed Representative Seth Moulton in the Fifth Congressional District?
Dan Koh, a former Biden White House aide, is the only Democratic candidate whose campaign features video testimonials from both President Biden and Vice President Harris. He is vying in a five‑candidate primary to fill Representative Seth Moulton’s seat.
Koh highlights endorsements from five former Biden cabinet secretaries, including Gina Raimondo, former Rhode Island governor and commerce secretary. However, in an electorate increasingly skeptical of the Biden era, those ties may not strongly sway voters. Instead, more than $700,000 in independent expenditures from pro‑AI super PACs has poured into supporting his campaign.
Koh’s primary opponent, state legislator Tram Nguyen, is consolidating progressive support in the district. She carries endorsements from Representatives Ayanna Pressley and Lori Trahan, who originally captured the seat in 2018 after a narrow 145‑vote primary victory over Koh.
Nguyen received a last‑minute endorsement on Saturday from Mariah Lancaster, a veterinarian who had herself been a candidate until withdrawing from the race.
