Ed Markey Beats Seth Moulton in Massachusetts Senate Primary

The Race That Was

Ed Markey just did what he's done before: fend off a younger challenger and hang onto his Senate seat. The AP projects the 80-year-old progressive has won the Massachusetts Democratic Senate primary over Rep. Seth Moulton, a 47-year-old Marine Corps veteran and moderate from Salem.

This wasn't a squeaker of a storyline so much as a rerun. Back in 2020, Markey beat back a primary challenge from then-Rep. Joe Kennedy III — another younger Democrat betting that generational change would beat incumbency. It didn't work then, and it didn't work now.

Old Guard vs. New Guard

The Markey-Moulton fight was less about policy differences (the two actually agreed on plenty, including abolishing ICE) and more about a generational argument. Moulton's pitch: Washington needs fresh energy, especially on fast-moving issues like AI, and it's time for new leadership. Markey's counter: experience matters, and he's more energized now than ever.

Markey came into the race with serious institutional backing — endorsements from Sen. Bernie Sanders, Sen. Elizabeth Warren, and Rep. Alexandria Ocasio-Cortez gave him a progressive firewall that made it hard for Moulton to break through.

Moulton's Pattern of Long-Shot Bets

This loss fits a pattern for Moulton. He first drew national attention in 2018 when he tried (and failed) to block Nancy Pelosi from reclaiming the House speakership, arguing then, too, that it was time for new leadership. University of Massachusetts Amherst political science professor Raymond La Raja described Moulton as someone who "likes to roll the dice" against entrenched power — and this Senate bid was just the latest roll.

What Comes Next

Markey now heads into the general election facing Republican John Deaton in November. Massachusetts hasn't elected a Republican senator since Scott Brown's brief tenure over a decade ago, so Markey enters as a heavy favorite. But the primary result raises a bigger question Democrats keep circling back to nationally: how long can senior incumbents hold off generational change within their own party, and at what point does that dynamic actually shift?

For now, the answer in Massachusetts is clear — voters chose experience over a changing of the guard, for the second cycle in a row.