In displaying all the signs that he is off his rocker, the Republican candidate has infected millions of others

Is Donald Trump going mad? It depends how you define the word. But since he’s hoping to be elected US president on Tuesday, it would be handy to know. Democrats describe him as “weird” and “unhinged”. His rival, Kamala Harris, raised the “M” question again last week. “This is someone who is “unstable, obsessed with revenge, consumed with grievance, and out for unchecked power,” she warned.

Harris, to her credit, was being relatively polite, though goodness knows why, given the way he disses and demeans her. So let’s pose the question in more colloquial, idiomatic terms. Has stark raving Trump finally lost his marbles? Are there bats in the belfry? If he’s off his rocker, not playing with a full deck and away with the fairies, the world and the voters have a right to know.