US Senator Edward Markey of Massachusetts has defeated Joe Kennedy III in a Democratic primary.
Markey had gained support from progressive leaders to overcome the challenge from a younger rival who is a member of a hugely famous political family.
It marks the first time a Kennedy has lost a race for US congress in the state. Kennedy is the son of former representative Joe Kennedy II, the grandson of Robert Kennedy, and the grand-nephew of John F Kennedy.
Kennedy said that while the results are not the ones he had hoped for, he would work for Markey’s re-election in the November poll.