Why an obscure left-wing MP won the UK Labour leadership by the biggest margin in history

In September, the British Labour Party elected a new leader, Jeremy Corbyn, a died-in-the-wool left-wing veteran MP who had been marginalised for decades by the increasingly right-wing Labour party -- how did an unassuming long-shot without much in the way of animal magnetism or rhetorical fire win the party leadership election by the most decisive landslide in British history? (more")