Via Instapundit, I see this Clarence Thomas video in which he says that the Court is"very heavily Northeastern" in its mentality. Thomas is not only the only African-American on the court, but as a native of Pin Point, Georgia, he's also the only Southerner. Everyone else is from either the Northeast or California, and eight of them went to Ivy League schools.
You have to wonder why it's more important to appoint a "wise Latina" from the Bronx than it is to appoint someone to represent a whole region of America. See Why Not Affirmative Action For White Evangelicals? by Pat Buchanan for more.