I mean, that did happen in New Zealand not too long ago, and it has happened in the UK albeit not in the era of the universal suffrage. So, it is possible, though I agree unlikely!

Also, I saw a report of a focus group the other day of ‘undecideds’ who all said they were actually planning to vote Labour. So there are definitely undecideds in the polling who are going to split for Labour. Just, of course, not all of them. Sadly.