Norm Pattis thinks that Miers was a sacrificial lamb; the administration put her up knowing that she would never be confirmed. They would then submit a known conservative and whine about obstructionism when they faced stiff opposition from the left.
The theory certainly has a flair to it, I don’t want to believe that the Bush team is that cunning, but they haven’t lost many fights in Congress and have been, politically, very astute. Why would they screw up the Miers nomination so fantastically unless it was on purpose?
If Bush nominates a strong conservative I’m going to call Norm’s analysis correct, if we get a weaker conservative then Bush just screwed up. We will probably know the answer to that question in the next couple days.