I think what he's shown, and Blair before him, is you can win elections on a pro-Europe basis. And win them with some huge landslides at that.
I mean you go back to 2005, Labour got only 9.5 million votes, which was only 35% of the popular vote, compared to 1997 when they took 13.5 million votes and 43%... you can clearly see that Labour were declining in the eyes of the public but they still had a pretty hefty majority to be going on with.
The EU referendum was a joke.
We'd had the conservative government saying they were going to reduce net immigration to less than 100,000 per year, something they failed to do for 5 years running. Prime Minister David Cameron then said he was going to pop over to Brussles to negotiate a better deal, presumably channelling Margret Thatcher's ghost like something out of Harry Potter, and yet all seemed to return with was a blank piece of paper with some of the lesser known EU laws hastily scribbled on it.
Clearly the Tory vote wasn't going to save us.
But never fear, we also had the newly elected Leader of the Labour Party, Mr Jeremy Corbyn, who was well known for his Eurosceptic views even if he was not, at his point, very well known himself, ready to throw himself into the European cause like a mouse trying to break up a fight between two large cats. Well it could have been worse, he hadn't suffered a vote of no confidence then. But as said, Mr Corbyn could be seen travelling up and down the breadth of the country challenging the Eurosceptic views of the people, I'm sure.
It's a wonder we only lost it by 4 points.