The recent release of an audiotape by Bin Laden offering a truce in the war may be used to kick off the election year season of ratcheting up the fear of terrorism.
In his message bin Laden points to attacks in other countries and promises a new attack on the US and explains the reason for not doing so earlier:
As for the delay in carrying out similar operations in America, this was not due to the failure to breach your security measures. Operations are in preparation, and you will see them on your own ground once the preparations are finished, God willing.

The first is the extreme hypothetical: concocting some bizarre scenario (“A nuclear bomb is going to explode in New York City in one hour and only a captured terrorist knows where it is and how to defuse it.”) in which the only options seem to be torture or worse. The second is scaremongering, using inflammatory language to exaggerate beyond recognition either the powers of terrorists in general or some specific threat that was supposedly foiled by the authorities (Remember that Jose Padilla was originally supposed to have plans to detonate a ‘dirty bomb.’ That charge has been quietly dropped.) The third is to argue from the negative (“We don’t know, or can’t tell you, how many dastardly plots have been foiled or deterred by these government actions so we should fall on our knees in thanks to the government for carrying out these illegal actions that may have saved our lives.”)