Photo by Leon Neal/Getty Images If anybody was still looking for lessons in why the Jeremy Corbyn project failed, his former senior adviser is on hand to remind everyone. It is seemingly a subject his former acolytes never tire of, as they relentlessly publish on the topic. On Wednesday (14 December), one of the key architects of Labour’s catastrophic election defeat in 2019 wrote a comment piece in the Guardian decrying the state of the party that has for months held an average 20-point polling lead. “Where is Labour’s fervour?” writes Andrew Fisher, Corbyn’s executive director of policy from 2016-19....