The high esteem in which establishment politicians and commentators hold themselves is one of the more striking features of our public life. It's never more obvious than when they turn on an outsider like Nigel Farage. They fancy themselves as Shakespeare's Exeter before the Dauphin, all "scorn, slight regard, contempt", and whatever else "may not misbecome the mighty sender". Yet for all that lofty disdain, they cannot leave him alone.