Mormons vote for Republicans – everyone knows that. But they don’t like Trump. ‘Mormons place a high premium on being nice, and Trump is not nice,’ Matt Bowman, the author of The Mormon People, told ThinkProgress. After Mitt Romney said that Trump was a ‘phony, a fraud’ last March, Trump told a rally in Salt Lake City: ‘I have many friends that live in Salt Lake City – and by the way, Mitt Romney is not one of them. Are you sure he's a Mormon? Are we sure?’

While he was dying, Bob Bennett, the former Republican senator from Utah, told his wife and son: 'Are there any Muslims in the hospital? I’d love to go up to every single one of them to thank them for being in this country, and apologise to them on behalf of the Republican Party for Donald Trump.’

Utah, which is about 60 per cent Mormon, hasn’t gone blue for more than fifty years: campaigning there usually seems like a waste. Last month the Clinton campaign opened a field office in Salt Lake City, and on Tuesday it launched ‘Mormons for Hillary’.

Yesterday I shared the lift at Hampstead Tube with six Mormon 18-year-olds on their first mission trip abroad. 'Are you from Utah?' I asked the one standing nearest to me, and by the time we’d made it up to the station, the group had told me they were all supporting Hillary – but they had no idea they could vote absentee. They listened to me go on about how to register, that the deadline was soon, and that they really truly needed to vote, please vote, please tell their anti-Trump friends on other mission trips abroad that they could all vote absentee. I was feeling incredibly proud of myself. Then: 'This is clearly very important to you,' one of the boys said as we left the station. 'Now will you listen to me talk to you about something that's important to me?'