As Benjamin Franklin famously put it, Americans have a republic, if they can keep it. Preserving the Constitution and the democratic system it supports is the public's responsibility. One route the Constitution provides for discharging that duty is impeachment. Harvard Law professor Cass R. Sunstein provides a succinct citizen's guide to this essential tool of self-government. Taking us deeper than mere partisan politics, he illuminates the constitutional design behind impeachment and emphasizes the people s role in holding presidents accountable.