An ambulance stops by the roadside to help a man suffering from a heart attack. After desperate measures, the patient survives. Brought into hospital, he then makes a protracted and partial recovery. Then, two years later, far from feeling grateful, he sues the paramedics and doctors. If it were not for their interference, he insists, he would be as good as new. As for the heart attack, it was a minor event. He would have been far better off if he had been left alone.

That is the situation in which Dr Barack Obama finds himself. A large part of the American public has long since forgotten the gravity of the financial heart attack that hit the US in the autumn of 2008. The Republicans have convinced many voters that the intervention by the Democrats, not the catastrophe George W.?Bush bequeathed, explains the malaise. It is a propaganda coup.

Does President Obama deserve blame for this outcome? No and yes. No, because his treatment was right, in principle; yes, because it was too cautious, in practice.