Photo by Chris J Ratcliffe/Getty Images In some ways for the Labour leader, this is as good as it gets: Keir Starmer has never been so powerful before and will never be again. This may seem a wilful columnist’s paradox. We expect him, after all, to become prime minister later in the year, and that is real power – the institutional levers, cranks and handles this toolmaker’s son believes, rightly, are the only purpose of a political life. But power in government is different. Much bigger – and also much more constrained; by events crashing across the desk, by practical...