Corbynism
If you actually listen to what he says, rather than what the media says he says, he's not quite as extreme as you might think. And if you listen to what he's saying he will do (as distinct from his own personal beliefs) it makes even more sense: e.g. he is personally anti-nuclear but believes he should defer to the majority wishes of his party and retain both a nuclear deterrent and nuclear generation.
My hobby is chatting to random other dog walkers about politics on a very general level, without mentioning names or parties. More than half of people I have spoken to said that they think the NHS should get a massive boost and that the power and train companies should be re-nationalised. Then I tell them they should form a new party, because they are too left wing for Labour ... :-)