Seth Wilbur Moulton was born on October 24, 1978, in Salem, Massachusetts, to Lynn Alice Meader and Wilbur Thomas Moulton Jr., a real-estate attorney. He grew up in Marblehead and graduated from Phillips Academy in 1997. He earned a bachelor's degree in physics from Harvard College in 2001, then served as a Captain in the U.S. Marine Corps, completing four tours in Iraq as a combat infantry officer, where he was twice decorated for heroism. After his military service, Moulton earned master's degrees in business administration and public policy from Harvard in a dual program. He was first elected to Congress in 2014, representing Massachusetts's 6th congressional district since 2015, which includes much of Boston's northern suburbs such as Andover, Marblehead, Peabody, and Salem. He ran briefly for president in 2019 before withdrawing after failing to qualify for debates. At age 47, Moulton presents himself as a generational alternative to the 79-year-old incumbent Markey, emphasizing his military service, combat experience, and centrist-moderate Democratic positioning.
Moulton is known as a provocative and outspoken member of Congress who challenges Democratic Party establishment, having led an unsuccessful 2018 effort to remove Nancy Pelosi as House Speaker and calling for generational leadership. He sits on the Armed Services Committee and Transportation and Infrastructure Committee. Since launching his 2026 Senate campaign in October 2025, he has emphasized generational change, affordability, healthcare, national security, and Democratic Party reform.
Moulton's background as a Marine Corps combat veteran who served four tours in Iraq shapes his political identity and policy priorities, particularly on defense and national security. His career in Congress since 2015 has been marked by willingness to challenge Democratic leadership despite party backlash. He founded the Serve America PAC, which claims to have helped flip 24 seats from red to blue. His approach represents a centrist modernization strategy within the Democratic Party, though his comments on transgender athletes have created complications for his progressive credentials in deep-blue Massachusetts.
Calls for 'new generation of leadership' to replace veteran Democratic establishment
Moulton's entire campaign is predicated on age/generational arguments, criticizing Markey for being 79-80 years old and 'half a century' in Congress
Voting History: Led 2018 effort to oust Nancy Pelosi; called for Biden to exit 2024 race
Moderate Democrat focused on fiscal responsibility and targeted investments
Claims 'most progressive and aggressive affordability agenda'; supports Inflation Reduction Act for clean energy manufacturing; opposes blanket student debt forgiveness as regressive; supports means-testing entitlements and procurement reform
Voting History: Voted for fiscal reforms; opposed full student debt forgiveness
Complicated and contested - publicly supports LGBTQ+ protections but has raised concerns about transgender athletes in sports
In November 2024, stated he doesn't want his daughters 'getting run over on a playing field by a male or formerly male athlete'; campaign manager resigned in protest; but co-sponsored Transgender Bill of Rights in 2023 and 2026; says he will 'fight to pass full federal LGBTQ+ anti-discrimination policies'
Voting History: Co-sponsored Transgender Bill of Rights 2023 and 2026; member of Congressional Equality Caucus; but made controversial comments about transgender athletes
Supports immigration as 'secret sauce' for American competitiveness
Argues immigration is essential for innovation and economic competitiveness; opposes Trump administration's persecution of immigrants; brought undocumented immigrant from Milford, Massachusetts to 2026 State of the Union address
Voting History: Pro-immigration voting record
Moderate on defense with military expertise
Sits on Armed Services Committee; has military combat experience; has expressed concerns about Trump administration policies on Iran; advocated for Pentagon academic funding continuation
Voting History: Moderate defense voting record reflecting military background
Moulton has served in the House since 2015, representing Massachusetts's 6th district. He sits on the Armed Services Committee and Transportation and Infrastructure Committee. His voting record reflects a centrist-moderate approach within the Democratic Party, supporting defense spending, fiscal responsibility measures, and targeted rather than universal programs. He is known for challenging Democratic Party leadership and for his outspoken social media presence, sometimes taking positions to the right of party progressives.
Moulton's social media tone is provocative and direct, reflecting his reputation as an 'agitating and bold voice' within the Democratic Party. His posts tend to be more combative and pointed than Markey's, focusing on party internal criticism and anti-Trump messaging. However, his social media strategy faces significant headwinds against Markey's established youth engagement network.
Video claiming President Trump is 'obviously in the Epstein files - common sense be damned' with Doja Cat's 'Paint the Town Red' playing
Went viral with 2.7+ million views, more than 5x his next most-popular TikTok
Moulton is launching a campaign during government crises while Markey works to stop Trump's extremist agenda and fight for healthcare protections
Markey campaign manager Cam Charbonnier emphasized Markey is 'doing his job' while Moulton campaigns
Moulton is 'one of the leaders refusing to stand up to Trump' and is trying to unseat 'one of the people in Congress who has done the most to fight back against Trump'
Youth climate organization criticized Moulton for insufficient anti-Trump activism compared to Markey
Moulton is 'closer to our age' but not 'closer to what young people want to see in political leadership' - his moderate centrism doesn't align with progressive youth priorities
College Democrats and youth activists view Moulton as insufficiently progressive despite generational argument