Justice O'Connor has passed away. May she rest in peace. My first thought upon hearing of this sad event was about the CASEY decision in 1992, and about how this looks in retrospect. Casey came just as a twelve-year period of continuous Republican occupation of the White House was ending. Clinton won the election that year -- before then, Reagan and the elder Bush had been President, and it was widely believed that they had put enough Federalist Society types on the High Court to ensure that ROE v. WADE was going to be overturned. Yet Casey surprised people. Not only was ROE not overturned, what the court called its "essential holding" was specifically retained. This was due to the emergence of a "centrist bloc" consisting of Antony Kennedy, David Souter, and ... Sandra Day O'Connor. Although their decisive opinion in CASEY was put out as a joint opinion -- no one author among the three -- O'Connor was the one of the three with the greatest seniorit...