Suppose you don't know who the Big Wheels in the U.S. government are. Other than the President, you haven't heard of any of them. You're in a foreign country that you don't really understand.
You can tell by turning on the TV who the big networks are. And driving down the freeway, you saw that building named "American Media." You pick up a newspaper, and there are big stories about this Daschle character and some guy named Leahy. You don't know who they are, but they must be important to get such news coverage.
The explanation could be that easy.
Yes, I think the fact that the first attack was on a small Florida company that prints supermarket circulars, that no one ever heard of but which had the name, "American Media" AND was next door to Mohammed Atta's digs is virtually diagnostic of hostile non-American involvement.
"The explanation could be that easy."
It could be even easier. Addressing the anthrax to the Democrats makes it more plausible that a "right-wing crazy" was responsible for the attack. Thus providing a degree of cover and serving one major objective of terrorism: to divide the target against itself.