Mass. Sen. Ed Markey will defeat Rep. Seth Moulton in Democratic primary, AP projects

Massachusetts also has primaries for several House races and governor.

In Massachusetts' Democratic Senate primary, the Associated Press projects incumbent Sen. Ed Markey will win.

Markey, an 80-year-old progressive, staved off a challenge by Rep. Seth Moulton, a 47-year-old Marine Corps veteran from Salem who is a member of the moderate New Democrat Coalition.

The race between Markey and Moulton was defined by the generational divide between the two members of Congress. Moulton argued that it was time for a new generation to represent the state in Washington, especially regarding issues such as artificial intelligence, while Markey, who first went to Washington as a House member in 1976, stood by his track record and said he was more energized than he had ever been.

Markey, who was endorsed by Sens. Bernie Sanders and Elizabeth Warren as well as Rep. Alexandria Ocasio-Cortez, is expected to face Republican John Deaton in November.

This is the second Senate primary in a row in which Markey defeated a younger Democrat. In 2020, Rep. Joe Kennedy III ran against Markey, but lost.

Moulton rose to prominence in 2018 after unsuccessfully attempting to block Nancy Pelosi from regaining her position as speaker of the House. At the time, he also argued that it was time for a new generation of leadership.

"He likes to roll the dice," Raymond La Raja, a political science professor at the University of Massachusetts Amherst, told ABC News ahead of the primary. "He even ran for president at one point. And here's another instance of him rolling a dice against an incumbent in this Senate race."

While Markey and Moulton agreed on many issues, such as abolishing U.S. Immigration and Customs Enforcement (ICE), Moulton placed the generational divide between him and Markey at the center of the Senate primary race.

"We need the generation that grew up with the internet and is going to have to live for decades with the consequences of AI to chart the way forward," Moulton said during a debate in August hosted by ABC affiliate WCVB.

Markey said he had been the leader on internet and artificial intelligence safeguards. In March, he introduced the Youth AI Privacy Act.

"I just want to say it doesn't make any difference whether it's called 'Siri' or it's called 'Claude,'" Markey said during the debate while emphasizing the need for widespread protections.

Moulton responded, "How are we going to effectively regulate and keep big tech accountable if you can't even tell the difference between big tech programs?"

Rachael Cobb, an associate professor of political science at Suffolk University in Boston, told ABC News ahead of the primary that while Moulton was trying to make his understanding of technology a focus of his campaign, his base remained Democrats who were on the more moderate end of the party.