JD Vance is trying hard not to be weird – and it’s making him seem more menacing still | Emma Brockes

Trump's running mate is now trying to put on a civilised face. But that is clashing queasily with his extreme outlook

The overriding and at times darkly comic impression, watching JD Vance's exchange with Tim Walz in the vice-presidential debate on Tuesday night, was that Vance's top-line imperative was to demonstrate to America just how extravagantly not-weird he is. Nothing to see here! Just a guy with a placid expression, nice manners, a noble desire to find common sense, bipartisan solutions", and a lovely little quiff. His affect was so relaxed, so urbane, that at points during the debate he could have been twirling a cane and slinking around a corner like Top Cat.

And while the event itself is unlikely to move the election needle, the performance of the two contenders for vice-president was a useful measure of where each campaign thinks its weaknesses lie. Both men were required to perform sincerity, a tough call in such a rehearsed and high-pressure setting, but only Vance was tasked with having to perform normality - which he did, up to a point. Walz, meanwhile, had to struggle to back up his charm with something steelier and more purposeful than relatability. Whereas a candidate for president can be all flamboyance and jazz hands, it is the role of the vice-president to be a sober voice in the room - and for 90 minutes, both men tried to out-grownup each other.

Emma Brockes is a Guardian columnist