On Stoke Newington Church Street last night Diane Abbott formally launched her campaign for the Labour Party leadership. There were about 80 or 90 of us there: I’ve no idea whether that counts as a good turnout or not these days, though it was hard not to be impressed by the fact that a quarter of those present were middle-class black women, almost all young or youngish – there were probably only half a dozen people of Abbott’s own age (she’s 57) or older. A late-running Sikh with a steel-wool beard was the only indication of the Asian-British community. Abbott gave her ever-popular account of her life as The Little Engine That Could. Really, of course, this is what her campaign platform is, but naturally she felt obliged to make a few political observations in deference to conventional behaviour on these occasions.