Meanwhile his temperament, always perhaps his weak spot, has been found wanting. Sometimes the seat-of-the-pants method still works: his gut reaction over Georgia—to warn Russia off immediately—was the right one. Yet on the great issue of the campaign, the financial crisis, he has seemed all at sea, emitting panic and indecision. Mr McCain has never been particularly interested in economics, but, unlike Mr Obama, he has made little effort to catch up or to bring in good advisers (Doug Holtz-Eakin being the impressive exception).

The choice of Sarah Palin epitomised the sloppiness. It is not just that she is an unconvincing stand-in, nor even that she seems to have been chosen partly for her views on divisive social issues, notably abortion. Mr McCain made his most important appointment having met her just twice.

Ironically, given that he first won over so many independents by speaking his mind, the case for Mr McCain comes down to a piece of artifice: vote for him on the assumption that he does not believe a word of what he has been saying. Once he reaches the White House, runs this argument, he will put Mrs Palin back in her box, throw away his unrealistic tax plan and begin negotiations with the Democratic Congress. That is plausible; but it is a long way from the convincing case that Mr McCain could have made. Had he become president in 2000 instead of Mr Bush, the world might have had fewer problems. But this time it is beset by problems, and Mr McCain has not proved that he knows how to deal with them.