It’s Saturday morning, and the leadership contest for control of the Labour Party is underway. Although Sir Keir Starmer’s supporters say that their man will not resign following the party’s defeat in the Batley and Spen by-election, it looks like only a matter of time. He appears done for, fixed in the public imagination as a loser permanently falling short, destined to be another of those leaders of the opposition who fails to establish himself as a credible potential Prime Minister.