To the surprise of many, Warren was a much more liberal justice than had been anticipated. As a result, President Eisenhower is perhaps apocryphally said to have remarked that nominating Warren for the Chief Justice seat was "the biggest damned-fool mistake I ever made."[12] Warren was able to craft a long series of landmark decisions including:
Brown v. Board of Education 347 U.S. 483 (1954), which banned the segregation of public schools;
the "one man, one vote" cases of 1962–1964, which dramatically altered the relative power of rural regions in many states;
Gideon v. Wainwright, 372 U.S. 335 (1963), which held that the Sixth Amendment required that indigent non-capital criminal defendants receive publicly-funded counsel (the law to that point requiring the assignment of free counsel only to indigent capital defendants);
Miranda v. Arizona, 384 U.S. 436 (1966), which required that certain rights of a person being interrogated while in police custody be clearly explained, including the right to an attorney (often called the "Miranda warning").
http://en.wikipedia.org/wiki/Earl_Warren#The_Warren_Court