U.S. Senator Bernie Sanders, the socialist democrat who pledged to lead a political revolution into the White House, has ended his presidential bid. He left the race after his once-strong lead in the Democratic primary evaporated as the party’s establishment lined swiftly up behind rival Joe Biden. The Vermont senator’s announcement came as a setback for many young people supporting Sanders. But it cleared a significant hurdle for Biden, who is now the expected Democratic nominee to challenge President Donald Trump in a general election overshadowed by the coronavirus pandemic.