By far the best way to stop an attack is to go after the terrorists where they have their havens, which is basically the Bush doctrine (although we haven't found a way to effectively get at them in the northwest of Pakistan).
If the Rats either through control of Congress or the Presidency withdraw our efforts to mostly within our own borders, then Tancredo is right in that it will just be a matter of time before a WMD attack here. Neither the Rats nor the Chamber of Commerce Republicans have the desire to control our borders or track dangerous foreigners in the country.
So you've decided to vote for Obama?