As if the entertainment offered by Mitt Romney’s Flying Circus wasn’t enough, tonight we will have Cameron on Letterman. Everybody other than the Prime Minister can foresee trouble in the offing. Letterman: “How long have you been cutting your own hair?” Boris Johnson: “Gulp”. And he wasn’t even a member of parliament, let alone a serving Prime Minister.

The problem is that Cameron has always been two men in one skin. The PR man cries out for stunts like this. The politician wrings its hands and cries: “Dave, don’t do it. Please. Obama can play basketball. You cannot. Obama can dance. As we saw at the Olympic opening ceremony, you cannot”. But in this case, the still small voice of reason has been drowned out. The Prime Minister will be placed in front of his own goal with the ball at his feet, and the crowd willing him to shoot.

And then there’s the poodle question. This word, which followed Tony Blair around like the smell of rotting corpses, has been absent from the public consciousness for years. But there is a real danger that in trying to fit in with the Americans’ laid-back style, Cameron will look like a patsy. Continue reading on the Telegraph website