A testament to what it means to be liberal by one of the most prominent political philosophers of our era "Walzer is perhaps our foremost pilot on these rocky shoals. In his preface, he writes that this may be his last book. One hopes not."--James Traub, New York Times There was a time when liberalism was an ism like any other, but that time, writes Michael Walzer, is gone. "Liberal" now conveys not a specific ideology...