Massachusetts Congressman Seth Moulton has officially announced his candidacy for the U.S. Senate seat currently held by Senator Ed Markey, positioning himself as a challenger focused on ushering in a new generation of Democratic leaders. As Markey, a veteran senator, prepares for reelection, Moulton is emphasizing the need for fresh approaches within the party and invoking age as a factor in his campaign. This primary challenge is reminiscent of historical contests, raising questions about the implications of generational change within the Democratic Party in Massachusetts.