THIS BRINGS TO A CONCLUSION THESE POSTS on the importance of mayors around the world. There is a such a diversity among them, but it’s clear that the ones we have focused on have some clear things in common, namely a desire to make cities more central in the political universe, and the distinct belief that in order to achieve success they must share the power with the citizens of their respective communities. And we as voters have learned something as well: to put aside our past belief that one political individual, or even a grouping of them, are capable of providing the kind of collective and meaningful life we are seeking. The claims of some political aspirants that they will clean up a city…