Presidential influence transcends some of the barriers imposed by the separation of powers to influence decision making by the Supreme Court. Specifically, we test Robert Scigliano's proposition that an informal and limited alliance exists between the president and the Court. The analysis utilizes Supreme Court decisions on civil rights and civil liberties cases from 1953 to 2000 to assess the effects of the presidency, Congress, judicial policy preferences, and legal factors on the Court. The findings demonstrate that presidential ideology influences Court decisions, while the effects of Congress are more conditional and limited. The results provide support for Scigliano's notion of an informal alliance.