How much of the background of those you listed do you know? I mean THEIR PERSONAL BACKGROUND. I'll bet the President has more information on them than you do, and that he nominated Miers because she can make it through the DEMOCRAT ANAL EXAM that will be given for every Republican nominee. Betcha! Those ALREADY on the bench somewhere, as those on your list are, have LOTS to lose if their backgrounds aren't CLEAN as a raindrop in the rainforest.
I don't think Teddy or Biden would want to go there with a nominee like Brown, who would fight back.