ImpeachmentBy: Cass R. Sunstein With insight, wisdom, affection, and concern, Sunstein has written the story of impeachment every citizen needs to know. This is a remarkable, essential book. Doris Kearns Goodwin No one is above the law, not even the president. Impeachment is the most potent tool the founders gave us to ensure it, and yet few of us even know how it works. As Benjamin Franklin famously put it, Americans have a republic, if we can keep it.