Warren was appointed by Eisenhower.
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He is best known for the decisions of the Warren Court, which ended school segregation and transformed many areas of American law, especially regarding the rights of the accused, ending public-school-sponsored prayer, and requiring "one-man-one vote" rules of apportionment. He made the Court a power center on a more even base with Congress and the presidency especially through four landmark decisions: Brown v. Board of Education (1954), Gideon v. Wainwright (1963), Reynolds v. Sims (1964), and Miranda v. Arizona (1966).
Kennedy was not very popular for the desegregation, and coupled with some of the other things listed above, Texans very will could have been furious with him on these issues.