“This is an indispensable book for any student of American political development. Through detailed, careful research, Stephen Engel convincingly shows that judicial power grew in tandem with politicians’ changing conceptions of the legitimacy of stable political opposition in the United States. In a major advance, Engel explains that politicians after the Civil War became more likely to harness judicial power in pursuit of their political purposes than to simply attack and undermine it. By placing the development of court-party relations at the center of his analysis, Engel shines the spotlight on how the interaction of separate institutional and ideational orders drives political change. In so doing, he reveals how judicial authority, while seemingly secure today, remains subject to political manipulation in the future.” – Daniel J. Galvin, Northwestern University, author of Presidential Party Building: Dwight D. Eisenhower to George W. Bush