If I was a truly cynical person, I might suggest the clue for Chuka Umunna's political epiphany, that his future lay with the Lib Dems, lay in this line: "My own Streatham constituency voted more strongly to Remain than any other, and on May 23rd this year, Liberal Democrats topped the poll there."
But I'm not remotely cynical...
EDIT: Interesting read, though.
Although, I have to say that the new poll is kind of like asking someone on the gallows how they'd prefer to be executed.