Constitutional litigation in general attracts two distinct types of conflict: disputes of a highly politicized or culturally controversial nature and requests from citizens claiming a violation of a fundamental constitutional right. The side-by-side comparison between the U.S. Supreme Court and the German Federal Constitutional Court provides a novel socio-legal approach in studying constitutional litigation, focusing on conditions of mobilisation, decision-making and implementation. This updated and revised second edition includes a number of new contributions on the political status of the courts in their democratic political cultures.