Democratic Massachusetts congressman Seth Moulton, who has bucked his party's stances on transgender issues, will challenge Sen. Ed Markey for his Senate seat in 2026, pitting the 46-year-old Marine veteran against one of the Democratic Party's oldest progressives. Moulton made age a central issue in his announcement video , saying, "I don't think someone who's been in Congress for half a century is the right person to meet this moment and win the future." "We're in a crisis," Moulton went on, "