“Pretend I’m the candidate,” he said at the Dallas convention, promising that “if the Republicans win control of both the House and the Senate of the United States, I will distribute a dividend of $5,000 to every adult citizen of the United States of America.”

From New York to Washington, the DSA is winning primaries and local councils and aims to change the Democratic Party from within. But its base – young and educated – is far removed from the working class it claims to represent. November will be the first real test