Two years on from his historic election victory, US President Barack Obama is trying to recover his lost magic as defeat for the Democrats looms in the midterm elections. But he is no longer the man he used to be, and his window of opportunity has passed.

He wants everything to be as it was before. He wants it to be as innocent and passionate, as honest and boundless. He wants it to be as full of promises and the conviction that everything is possible in the Land of Opportunity. Because, as he told his supporters back then, "We are the ones we've been waiting for." It was a rallying cry so powerful and romantic it sounded like a line from a good song.