IMO, whenever (not if ever) Al Qaeda gets a working nuke, they'll make plans to set it off in the USA. Without hesitation. The only way to make sure of preventing such a thing is to eradicate Al Qaeda and the rest of the terrorist gangs, along with the countries that provide them support.
Bush gets this, I believe. I think middle America may have decided it could be more fun to put its head in the sand. I hope not, but we'll see.