John McDonnell was first with the theory, as soon as the exit poll had stunned the nation. “Brexit dominated the election,” he said. “I think people are frustrated and want Brexit out of the way.” The theme was taken up over the hours and days that followed, culminating in the claim Labour “won the argument” and that Jeremy Corbyn’s leadership had nothing to do with the party’s worst result since 1935. Brexit alone was to blame.
Well, if this is the result you get when you win the argument, we can only imagine what losing it would look like. But what about the idea that the result can be put entirely down to Brexit, rather than the broader questions of policy and leadership that usually go into people’s voting decisions?