[S.T.D.]

This is more than a rhetorical question. The relative inactivity of al Qaeda these past six years, as well as the political situation in Pakistan, has imposed a shaky equilibrium on the issue. Al Qaeda's security protocols curtail al Qaeda's threat level, and that has allowed the United States to shelve the issue for another day. Meanwhile, the instability of Musharraf's government limits the United States' ability to pressure Islamabad over the issue of al Qaeda. Consequently, al Qaeda has been more or less hiding in plain sight.

Alter any aspect of this scenario -- in this case, drastically increase the tottering of the Musharraf government -- and the "stability" of the other pieces immediately breaks and the United States is forced to surge assets into Pakistan.

Washington has to assume that an al Qaeda anywhere but Pakistan is an al Qaeda that will act with less conservatism. By the American logic, al Qaeda assets in Saudi Arabia, long drilled that security is paramount, would naturally doubt that a telegram from bin Laden ordering a new attack is genuine -- but they would certainly believe bin Laden himself should he show up at their door. By al Qaeda's logic, Musharraf's fall would force al Qaeda to relocate from Pakistan because the group would have to assume that the Americans would be coming.

Which means the odd stasis in the war on terror these past six years could be about to loosen up, and a front that has proven oddly cold might be about to catch fire.

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