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I think the sad truth is that he's an eternal local MP. Have you ever worked anywhere, and come across those institutionalised people who have always done what they do, and will never do anything different. There are lots of them around. Corbyn is exactly that kind of person, and is so very fossilised by his pedestrian history of minor league rallying and activism. As you say he's been an MP for 33 years, yet no-one had ever heard of him. What had he been doing all that time? It was an embarrasment watching him take over the leadership role last year. He didn't have a clue what to do, and was just bumbling around. I doubt he even realised how much of an amateur he was being, and that tragic lack of self-awareness (buoyed by his own prviate bubble) will be his downfall. The population at large will (rightly or wrongly) never put their trust in such a man, so he won't ever be elected.
@Fox @boristrump
So those are all very valid explanations of Corbyn's success so far.
But explain to me why is he unelectable as PM?