Always wondered why Nixon, who of course was VP at the time, didn't counsel Ike against Warren's appointment. Nixon was from California, and you would think that he would have known Warren's true ideology. Maybe Nixon did speak out in private, and Ike didn't listen.
The truth is that the activist decisions written under Warren were not really written by Warren. Warren had a management style that basically encouraged the other members of the court to write what they wanted to write. He stood aside and let them do it, but it was not so much his doing. The other members of the court were very activist.