See the opening paragraph of the New York Times article on the recent political upheval.

The scenes of carnage in Pakistan this week conjured what one senior administration official on Friday called “the nightmare scenario” for President Bush’s last 15 months in office: Political meltdown in the one country where Al Qaeda, the Taliban, and nuclear weapons are all in play.

In Augues, I referred to Pakistan as an almost failed state. Significant portions of the country are not under government control, the place is lousy with automatic weapons, and there is a significant Islamist movement there.

Pakistan is not fully cooperating because it cannot. It would destabilize the already fragile country, and then its nuclear arsenal would be up for grabs.