He's a strange sort of entity, this euphoric rock star with the chin stubble and the tinted glasses - a new and heretofore undescribed planet in an emerging galaxy filled with transnational, multinational and subnational bodies. He's a kind of one-man state who fills his treasury with the global currency of fame. He is also, of course, an emanation of the celebrity culture. But it is Bono's willingness to invest his fame, and to do so with a steady sense of purpose and a tolerance for detail, that has made him the most politically effective figure in the recent history of popular culture.