Judicial scholars long have examined the external factors influencing U.S. Supreme Court decision making. Congressional and executive pressures, the Office of the U.S. Solicitor General, attorney experience, and the tactics of organized interests all have been found to be influential.
O'Connor, K., & Hermann, J. R. (1995). The clerk connection: Appearances before the Supreme Court by former law clerks. Judicature, 78, 247-249.