And of the 52% that voted for brexit? The problem I've found in politics is that politicians like to 'switch' their mandate depending on what's convenient. Half the time, rebellious MPs justify their behaviour by saying their "mandate comes from their constituents". So what of brexit? The majority of Labour MPs represent pro-leave constituencies. Now the same people are saying it's the "will of the membership" when that means nothing at all over any other issue.
I'm pro-Remain but I think Corbyn has been misrepresented by our media and colleagues so much that he's not going to do well no matter what. Christ, he was criticised for wearing a coat in typical British weather laying a wreath at the cenotaph.
That said, there is a section of the Labour party that has formed a dangerous echo chamber. I was routinely attacked by "friends" after saying Assad is an oppressive dictator. I was called names like "white supremacist imperialist" and, almost as bad, a Blairite. I left the party because it's a festering whole of negativity, anger and irrationality. I have misgivings about those people influencing policy, which it would invariably would via conference if Labour attained power.