His party were officially for remain, and as leader he had a responsibility to voice their point of view.
Something that was conspicuous by its absence, and honestly fudging shameful on his part.
It was about that point where it became obvious he doesnt give a fudge about the Labour party, only his own agenda. Which is basically Boris in a red tie, anything, any cost, whatever it takes for that PM job...
But as leader of his party he has a big part to play in setting their policy but I don't believe he ever put forward his case. I agree he's shown that he's no different from anyone else in that it's all about getting into power regardless of circumstances.
On campaigning I read the other day he actually appeared at more events than anyone else bar Cameron and Osborne and people like Swinson for instance barely appeared at any and only tweeted for remain once. Whatever the truth he was a lame campaigner for remain - I think generally he's not a great campaigner anyway or certainly not one leading from the front. Much better at protesting.