From the New Republic:
Evangelicals began aggressively reaching out to Catholics for intellectual aid. That movement reached its apotheosis with the nomination of Samuel Alito to the Supreme Court. With his addition to the ranks of Antonin Scalia, Anthony Kennedy, Clarence Thomas, and John Roberts, all five members of the Court's conservative majority would be Catholics. ...
[T]he emergence of the Court's Catholic bloc reflects the reality of social conservatism: Evangelicals supply the political energy, Catholics the intellectual heft. ...
Link.