Because he has too much dignity to continue to ride aboard the clown car for any more absurd majority decisions.
Quitting and writing a tell-all book about what really goes on in there would be much more helpful to the nation.
Ginsburg does a lot of napping. As for Sotomayor and Kagan, they're probably on the line with the White House a lot to see how they should vote.
Not much left to be told. There’s Bob Woodward’s book, ‘The Brethern’, Michael Toobin’s book, ‘The Nine’ and many others.
http://www.streetlaw.org/en/Page/39/Books_About_the_Supreme_Court
What’s lacking isn’t knowledge. What’s lacking is the will to restrain them.