North Korea
The war taught one lesson to dictators: if you want to save your regime, stockpile nuclear weapons. Those with such weapons won't be attacked. Those without, may be.
Such a lesson!
No matter what happens in Iraq, if this lesson stands the war will have been a disaster for this country.
So the Bush administration faces 2 great challenges in the next 2 years.
1. Fix Iraq.
2. Figure out a way to teach a new lesson: that a rogue country which chooses to pursue the accumulation of nuclear weapons faces serious consequences.
Oh and yes there's still that other problem: Terrorism.
Unfortunately, the administration's bungling in Iraq has made solving that problem even harder.