This long-popular constitutional law casebook has added two new co-authors for its newest (12th) new edition, Michael Dorf and Frederick Schauer, who have brought deep background and rich insight in helping to bring the book thoroughly up to date. In preparing the new edition, the authors have retained the basic format of prior editions, but have added new cases and re-edited old ones to ensure coverage of important topics in manageable numbers of pages. The Notes and Questions, which have long been a hallmark of the book, continue to present a wide range of perspectives for students to consider, rather than reflecting a single point of view that users of the book must either adopt or teach against. Professors will especially like the illuminating and provocative extracts from the literature that accompany important new cases involving the Affordable Care Act, same-sex marriage, affirmative action, and campaign finance and freedom of speech.