With the recent news that David Souter is retiring from the Supreme Court, President Obama will have his first opportunity to appoint a Supreme Court Justice. Putting aside speculation on what Obama might in fact do, I want to comment briefly on the type of ideological appointment he ought to make (this ignores other characteristics, such as gender, race, and legal background, all of which are important to varying degrees).
There are basically two major options: One, appoint a strong liberal. Two, appoint, a wishy-washy liberal. At least in the short run, I think the latter is actually the better option.
Justice Kennedy is the median vote, with Stevens, Ginsburg, Breyer, and Souter/Replacement comprising the liberal wing; Scalia, Thomas, Roberts, and Alito comprise the conservative wing. So Obama can't actually move the median until one of the conservatives (probably Scalia) or Kennedy himself retires. Given that, the question is how to move the law to the left.
Appointing another Bill Brennan or Thurgood Marshall would be gratifying, but it would not move the law to the left. Recent empirical work by Lee Epstein and others on supermedian Justices suggests that appointment of a moderate, say, right of Breyer but left of Kennedy, would dilute Kennedy's power by allowing Moderate Replacement to write some of the controversial opinions (since there would now be two median Justices) — while the outcomes would be the same, those opinions would likely be, in minor ways, more agreeable to the left. More important, Kennedy would be more likely to join the Court's liberal wing, and on occasion he would. That is because he is more likely to accommodate or to be swayed by an ideoligcally proximate Justice than by an ideologically distant one. There is a pretty big gap from Breyer to Kennedy, and from Kennedy to Alito. A far-left appointment would decrease the odds of Kennedy voting for the preferred liberal result in the cases where these things matter.
At minimum, there is reason to not be dismayed if Obama appoints a moderate rather than a liberal (by which I mean ideology in Court terms; in U.S. politics generally, of course, Scalia and Thomas are radically right-wing, Kennedy is a conservative rather than a moderate, and even Ginsburg is moderate or slightly liberal [Stevens is more of a liberal, but still not a far-left liberal in the way that Scalia is a far-right conservative]).
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