"Johnson’s shtick will wear thin eventually, and that will be an opportunity for Labour. But lost voters will not snap out of a trance, wonder by what witchcraft they were seduced into being Tories, and pick up their old ancestral allegiance.
"In over a decade of opposition, Labour has offered many policies that it thinks voters should like, buttressed with solid reasons to reject the Tories. It hasn’t worked. One thing no leader has attempted is a candid, humble explanation for why the party keeps losing, complete with a credible display of understanding why voters switched sides. It doesn’t come easily.
"The left is conditioned to doubt that any decent human being could be a Tory. That is the barrier to empathy across which no minds are changed. The alternative is to keep running the same old campaign against the same old Tories, and to keep on losing because Britain doesn’t have the same old politics, or the same old voters."
(Rafael Behr, extract from an article "Labour keeps pushing the ‘same old Tories’ line – but voters have moved on," which you can read in full here.)