It generally takes about two years for a new Administration to fully purge itself of the leftover scum of the old one. Those two years have passed.
The only Clintonistas in the Executive Branch that Bush has to worry about are in the State Department, and as the bitchslapping into line of Colin Powell shows, they have been completely marginalized ... which explains why they've been reduced to putting up nasty Bush-hate editorial cartoons on the walls of Foggy Bottom. (And personally, I think a White House staffer should simply walk the halls of State, note every office with such "artwork," and hand a list of those staffers back to the WH staff to be directly fired by President Bush.)