He has betrayed his party’s own manifesto in the 2017 general election, which promised to respect the outcome of the referendum. He has betrayed his old Labour mentors, most notably his hero Tony Benn, who was the left’s most articulate critic of the EU. And he has betrayed himself. He has betrayed his own longstanding and correct belief that the EU is an illiberal, undemocratic, anti-worker outrage of an institution. Has any politician ever betrayed so many people in such a short space of time?