Wretchard,
“Expecting Islamabad to crack down on the LeT or the Taliban is like hoping the Democrats will crack down on Barney Frank or Bill Ayers. ”

Not that hard to do if done on the QT, via providing intel. Which may be behind the recent Predator strikes in Pakistan. That allows the Pakistani government to deny involvement and thus avoid internal political ramifications, while still appeasing the U.S.

It does require the government having the upper hand in the ISI, though, which is questionable.