Steve Bannon is on a mission. President Trump’s former chief strategist has visited Europe twice in the past four months, touring several capitals. He has been spreading the gospel of the “national populist revolt”, and he sees Europe as fertile ground for his global crusade. Maybe there is some truth in that. Italy’s current politics are a gift to him. But he has also been applauded by audiences in Prague, Budapest and France. Have we been paying enough attention?