Tony Blair has announced his intention to "re-engage" with British politics. It is an event that has attracted much attention. With varying levels of horror and titillation, pundits of right and left have pored over his statements, and sought to divine his ambitions. They have variously predicted that he wants to be Prime Minister, or run the IMF, or the UN, or the EU. None of these seem especially plausible. Nor does the idea that he could be a member of the Shadow Cabinet; how, without overshadowing his own boss? Yet one prominent job has not been suggested: I believe Tony Blair may run for London Mayor.