The debut poll by new polling firm Deltapoll, founded by former YouGov pollster Joe Twyman and ICM’s Martin Boon, has found that more than half of voters think Labour has an anti-Semitism problem and over a third think Jeremy Corbyn is himself anti-Semitic. 51% think Labour has at least pockets of anti-Semitism, and 34% think those pockets include the leader. That’s one poll Owen Jones won’t be gloating about.