I would support President Obama if he orders a strike on Pakistan. Our original goal, when invading Afghanistan, was to wipe out the Taliban...a group responsible for the events of 9/11.
Pakistan's government is in serious trouble, and the country is in near total anarchy. The current govt. is either unable or unwilling to intervene within their own borders to oust the Taliban, and now the Taliban is only 60 miles from the Pakistani capital city.
If the current govt. (such as it is) collapses into anarchy, their nuclear missle forces are at the mercy of the Taliban or other terrorist groups. It is unclear whether the Pakistani military can stop a takeover by a well-armed terrorist group, and the subsequent capture of the country's nuclear forces.
It would certainly be dire indeed if this were to happen. I have no doubts that the Taliban, Al Queda, or other terrorist groups would use these WMDs to further their own crazed, fanatical goals.
The U.S. may need to intervene militarily to keep this from taking place.