Brilliantly put throughout, Christine. The worst thing is that the damage has already been done. If he stays in, he loses. If he drops out, his successor lacks credibility and unity, as there will have been no proper, normal primary process settling down into 'we all love this nominee' lies at conference.

Plus, Trump has the argument: "Democrats? They told you Joe was their guy, that he was fine. Turns out he's lost his mind and had to be taken off to the funny farm. And that's the guy they were trying to sell you as President? Lies! It's all lies from them - even about their own candidate!! But you can trust me, straight-talking Donald!!!"

SNAFU.