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Realistically, since forever.
It shouldn't happen but it does. If Thornberry became the leader do you think the papers like the Mail or the Sun wouldn't use that to attack her? Johnson has "inadvertently" made reference to it in the past.
If you're trying to win back the disillusioned, northern, working-class vote then having "Lady Nugee" the MP for Islington in charge, however irrelevant it is in reality, is going to make it harder.
I'd say the same thing applies to Keir Starmer at the moment as well.
Add to that the fact she's technically "Lady Nugee" and her constituency is Islington and she's going to struggle to win over a lot of the disenfranchised voters.
Dan Jarvis would be my tip.