Nuclear terrorism is the #1 threat against the United States. I hope that President Bush forcefully makes that point in his next State of the Union address, because it cannot be stressed enough.
I see the threat of a radiological bomb as being a high probability. Fission devices? It just depends whether you choose to believe the stories. But I continue to have a real bad feeling that a few vials of genetically altered smallpox virus or other bio agent will be the knock-down strike on this country. There would be nowhere to hide.