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It doesn't have to be a second referendum: Even voting NO if what comes back from negotiations, on the balance of probabilities, will harm their constituencies more than staying in the EU or demanding money to solve issues is something.
Talk about the EU being "technocrats" and "capitalists" and "undemocratic" and then playing in the hands of exactly those types in the UK, don't see that ending well.
2/3 of Labour MPs represent constituencies that voted leave. If you're curious as to why Labour isn't demanding a second referendum, you may as well ask why the Tories aren't doing the same. To pretend that this is all about Corbyn isn't particularly helpful (or even close to being accurate). This is a Labour problem. You think Umunna would do things differently? Take a look at his position on this.
(In other news, I have just learned that "riding" is a Canadian political term. If I used it in this context would anyone know what I was talking about?)