Short of sticking two pencils up his nose and muttering the word “wibble”, Trump’s appearance on the debate stage on Tuesday night was never going to prove, decisively, to those on the fence, that he is unfit for high office. Unlike Biden’s disastrous turn two and a half months ago, chaos is part of Trump’s appeal – and if his thoughts are garbled, it signifies nothing beyond business as usual. And yet, even for Trump, aspects of his debate performance in Pennsylvania came so close to the edge on Tuesday that the next day what seemed most astonishing wasn’t that Harris had performed so well but that so many apparently sentient human beings were still shilling for her unhinged opponent.

Heading into the encounter, one had the strangest sense both of the height of the stakes and also of the sheer entertainment value of the encounter. I found myself wondering about Harris’s nerves – how a person handles them in such a unique situation. In the debate’s opening moments, the vice-president did indeed seem nervous. But she settled, and about 15 minutes in, it started to happen: while Harris’s keenly controlled anger rose to a point, Trump, mouth bunching, eyes disappearing into his head, unravelled.

A reference by Harris to her endorsement from Trump’s alma mater, the Wharton School, and some senior Republicans including – confusing for liberals! – Dick Cheney triggered a volley of “she”s from Trump. She, she, she, he said – always a sign he is losing it against a female antagonist. “She copied Biden’s plan and it’s like four sentences, like Run Spot Run!” And off he went on his downward spiral.

The next day, consumers of American........

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