Could it be simply that now that Bush got re-elected, the usefulness of Christian braunen Batallionen has expired for the ruling class, and the night of the long knives has begun http://en.wikipedia.org/wiki/Night_of_the_Long_Knives.
Ashcroft, like Ernst Roehm http://en.wikipedia.org/wiki/Rohm, was popular with the rabble that brought Der Fuehrer to power but also a zealot and a lose cannon, and that bothered the elite, so he had to be replaced with more slick and agreeable functionary.
Wojtek