Timing is everything.....
Fox News just reported that Bush made his mind up on Scalito on Friday afternoon. However, he waited until Monday morning to formally announce him.
If this is true, his decision would have come within hours of Meirs stepping down, meaning Bush probably decided on Scalito even before Miers "withdrew".
The timing of this says a great deal about the political strategy of the white house. More than likely, all of this was orchestrated weeks ago, rather than days (no surprise there!).