Oh... this is one of those savvy 'timing' things that the Bush team does well.
Bush's choice for the Supreme court is doing pretty well so far. The Dem's will complain but likely conclude things could have been worse. I'd bet they don't want to screw up a relatively good deal, so can't do much about Bolton. The next Supreme Court vacancy will be a different story if it occurs anytime soon.
For a 'normal' president I'd be pretty sure that appointing Bolton was a dangerous mistake: Bush OWNS all this guy's stupid mistakes now, but not any successes. That can't be good. But Bush has a Teflon coating that Clinton probably had wet dreams about. No amount of mistakes seems enough, and his followers are loyal and think him an honest guy like them. I can give a nod to the elegance and durability of the facade.
Bolton is probably a bright guy, but his character is that of an employee who wants everything their way and can't compromise or work well with people. If you have to threaten people to get things done you are a loser as a leader. (What a great person to send into a building full of diplomats.)
But Bush does not want Bolton there as a 'leader'. Bolton is there as a Bush cudgel. I expect an early thing we will see is him working for more UN involvement in assisting the US out of the Iraq morass. The UN is only seen as useful when it is a tool of US policy.