Clarence Mitchell, (1911-1984), earned the nickname the "101st. Senator," thanks to his effective USA lobbying efforts for civil rights.
His influence helped pass the 1964 Civil Rights Act, and the Voting Rights Act of 1965 (signed into law by President Lyndon Johnson on August 6, 1965, and just recently renewed for another 25 years by President George Bush in July, 2006).
Mitchell helped extend a ban against voting literacy tests in 1970. He was instrumental in gaining enforcement powers for the EEOC (Equal Employment Opportunity Commission) in 1972.
President Jimmy Carter awarded Mitchell the Medal of Freedom in 1980 for his lifetime battle for civil rights.