Massachusetts Rep. Seth Moulton’s (D) primary challenge against Sen. Ed Markey (D-Mass.) on generational grounds raises questions about the potency of the argument as Democrats grapple with the future of their party’s aging stalwarts. In a video launching his campaign, Moulton, 46, said he does not believe Markey, 79, should be running for another six-year term in the Senate at 80 years old. The challenge comes as Democrats have struggled with the issue of age following the deaths of three House Democrats earlier this year and the fallout over former President Biden’s decision to end his run for reelection last year on concerns over his fitness for office. 

However, this is not the first time Markey, a formidable incumbent, has had a generational primary challenge. Five years ago, he face

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