A US Senate Democratic primary has been decided, with CNN's Decision Desk projecting Sen. Ed Markey as the winner. He will defeat Rep. Seth Moulton, who challenged him in the primary. Markey is seeking a third full term and positioned himself as the more progressive option.

The primary was one of several races testing Democratic voters' appetite for change. Markey, 80, cast himself as anti-establishment in his campaign. His opponent, Moulton, is a six-term congressman who has sometimes gone against party leadership.

Further details about the primary and its outcome are available from the source. The race was notable for its ideological and generational divides, with Markey emerging as the projected winner.