The legitimate object of government is to do for a community of people, whatever they need to have done, but cannot do at all, or cannot so well do for themselves, in their separate and individual capacities.
Several suggestions listed here are out of print.
You may find these titles at used book shops. Thomas E. Dewey and His Times . The Autobiography of a Public Man . John V. Lindsay and the Silk Stocking Story . Political Philosophy Reflections of a Radical Moderate.