The president of the United States delivered his annual address to Congress on Thursday night – except what Americans and an increasingly nervous world wanted to assess was less the state of the union than the state of Joe Biden. I don’t mean politically, I mean physically.

In the week that confirmed the November election will be a rematch of the 2020 contest – the current president against the former one – Biden needed to prove he was not the doddering, even senile figure of Donald Trump’s rhetoric and a thousand social media memes. In 68 combative minutes, he cleared that bar. He ad-libbed, he took on Republican hecklers and, often at high volume, jabbed at his opponent. The result: a performance that pundits described as “feisty” and “scrappy”, free of senior moments, and which prompted even Fox News to muse that Biden seemed “jacked-up” – which, from the network that likes to depict the president as a walking corpse, was a compliment.

Projecting vigour was essential because the mountain Biden has to climb over the next eight months is getting steeper. For one thing, this week established that Trump is not only the certain nominee of his party – crushing his last remaining challenger, Nikki Haley, in all but one of the Super Tuesday primary contests and forcing her out of the race – he is in total control of it. Republicans in Congress are supine before him, whether it’s outgoing Senate leader Mitch McConnell endorsing him this week – even though Trump has repeatedly insulted McConnell’s Taiwan-born wife in nakedly racist terms and the two men have not spoken in three years – or the Republican refusal to pass a border deal they’d agreed with Democrats, because Trump wants the issue of immigration to remain unaddressed so that he can attack Biden for failing........

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