UPDATE 1600 GMT: Adam Quinn has expanded his analysis in a discussion with Monocle 24’s The Briefing on Tuesday afternoon — listen from 12:34:

Adam Quinn of the University of Birmingham sifts through the 2nd US Presidential debate, especially Donald Trump’s performance, in a discussion with BBC Three Counties Radio.

Listen to interview

Trump has this support base of 35%, maybe 40% in a very divided country with temperatures high politically. Those people are not turning away from him, no matter what he says or does.

To win the election, on the other hand, he probably needs another 5%, 6%, 7% of people.

Yesterday he made the people who love him very happy, but he said absolutely nothing that make anyone who is wavering — or whose concern is about the health of the political process — to come on to his side.

See also US Audio Analysis: “Trump is a Disaster” — The 2nd Presidential Debate
US Analysis: Politics Is in the Gutter — The 2nd Clinton-Trump Debate