Abstract Recent Supreme Court decisions have hobbled campaign finance regulation and placed significant constitutional constraints on possible future reforms. But the Supreme Court has not acted alone. Major constitutional changes often require a substantial legal and political infrastructure, an ecosystem of actors, ideas, strategies, and tactics to instantiate new constitutional doctrine into law. In Big Money Unleashed, Ann Southworth examines the composition, development, organization, and intellectual underpinning of the legal movement that has worked to cripple campaign finance regulation. She chronicles the raising and testing of the key legal theories; the sources of political and financial backing for the movement; the combination of disparate groups into an antireform coalition; and the organization of what has proven to be a very effective litigation strategy. The result, she explains, has been the ascendancy of a powerful constitutional discourse that treats money as speech, campaign spending as freedom, and government regulation as censorship. The antireform litigation campaign on its own would not have been enough to transform the law; key appointments to the Supreme Court were essential. But the movement provided the Court with the cases, the arguments, and broader political support that are part of constitutional change.