President Lyndon Johnson using the "N" word. - YouTube
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If Kessler is a source you won't accept (why?) I have one here from Beschloss, is he safe to believe?
THURGOOD MARSHALL
Judge, U.S. Court of Appeals
Wednesday, July 7, 1965, 1:30 P.M.
Johnson offers the job of Solicitor General to Judge Marshall, who famously championed school desegregation before the Supreme Court in the landmark 1954 case Brown v. Board of Education and succeeded in twenty-eight other cases before the Court. Without saying so flat-out, LBJ makes it clear that he intends one day to appoint Marshall as the first black Justice on the Supreme Court.
(This he ultimately did in June 1966. When an aide later suggested another black judge, Leon Higginbotham, for the Court, Johnson glared and said, "The only two people who ever heard of Judge Higginbotham are you and his mama. When I appoint a ****** to the bench, I want everyone to know he's a ******.")
Reaching for Glory: Lyndon Johnson's Secret White House Tapes, 1964-1965 by Michael R. Beschloss - Powell's Books