It is a universal political truth that administrations do not begin to fragment when things are going well: it only happens when they go badly, and those who think they know better begin to attack those who manifestly do not. The descent of Barack Obama's regime, characterised now by factionalism in the Democratic Party and talk of his being set to emulate Jimmy Carter as a one-term president, has been swift and precipitate. It was just 16 months ago that weeping men and women celebrated his victory over John McCain in the American presidential election. If they weep now, a year and six weeks into his rule, it is for different reasons.

Despite the efforts of some sections of opinion to talk the place up, America is mired in unhappiness, all the worse for the...