McCain
is not going to take on Obama about the Wright thing because he has his own skeletons in this regard. Some of the fundamentalist Christian leaders he's had to get in bed with to become viable in conservative circles again have said thing equally as repulsive as Wright without all the history of good that the man has as well.
By the way, the media is now tiring a bit of Clinton and are actually starting to show the full context tapes of Wright which make his rants quite a bit less threatening. Imagine that.
Art