Barack Obama is coming: Europe can scarcely contain itself. The Democratic contender for the White House is crossing the Atlantic to burnish his credentials as a world leader. Europeans just want to cheer.

I have my doubts as to whether Mr Obama will profit much from a series of photo-opportunities with the old continent's tired and beleaguered leaders. The Middle East leg of his trip may make more news at home. The crowds in Europe will be another story. When he steps out of his pre-presidential limousine Mr Obama can expect to be greeted as a messiah.