Over at the Monkey Cage, our very own Henry Farrell [sets out how Peter Mair’s brilliant *Ruling the Void*](http://www.washingtonpost.com/blogs/monkey-cage/wp/2015/09/14/this-book-explains-why-jeremy-corbyn-now-leads-labour-its-author-died-in-2011/) helps explain Corbyn’s recent triumph. A shout-out too for my friend [Martin O’Neill’s treatment of Corbyn’s victory at Al Jazeera](http://america.aljazeera.com/opinions/2015/9/the-unexpected-rise-of-jeremy-corbyn.html).