This week’s cover

In the week of their convention America’s Democrats are in a celebratory mood. They have ditched a candidate who, for all his admirable qualities, was visibly and audibly too frail to have much chance of re-election, or to govern for another four years. Instead of President Joe Biden they have Kamala Harris, a younger, fresher nominee who has quickly wiped out Donald Trump’s poll lead and wrong-footed him so badly that he is reduced to insisting he is better-looking than she is.