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It's more complicated than that though. I assume what he's referring to is the disillusionment of the traditional, working class, labour voters with the party and the way they've been poached by the far right. If you look at a lot of the voters that voted out then that's where they're located.
It's not a recent thing, and certainly didn't start with Corbyn (although he may have accelerated it).
It's a step remove from the active Brexit campaigning but I would say it had an impact.
Right.
I didn't see Labour MPs strongly campaigning for Brexit, unlike half of the Conservative MPs.
Sure, I didn't see the Labour leadership campaigning viably for Remain, but the grass roots of Labour and every other party I saw quite united in Remain.
Fault, if it is to be apportioned, lies squarely with the Leave camp of the Conservatives.