Corbyn’s election sets up a real-world challenge to a central belief of Australian Labor’s political class – that shifting to the left will not win elections. This betrays a two-dimensional sort of thinking that belongs to the analogue age: we only have to move the marker rightwards until we reach the magical point of electability. The social base, which made this sort of strategy a viable way of winning in the 1980s and 1990s, has changed. Trying to win more elections on this basis is most certainly madness.