It is possible they expected such and outrage about the Alien vs. Predator movie that there were expecting riots. But I think not (although it was pretty bad), the police would not confirm who might be staying there; it must be someone important they are getting ready to close some on ramps to 520.
I think I figured out who it is. George Bush will be having a fundraiser in Medina. $2500/person dinner. $5000 gets you a photo with George, $25,000 and you get a private meeting, and for $30,000 you get to punch him in the stomach. So with this information I am able to fully put the pieces together and I realized they are expecting Michael Moore or Al Frankin to make a showing. They are waiting at the Marriott to arrest whichever shows up.
On a similar note. I it would be pretty easy to write a program that randomly mails an innocent email (or one of many) containing many words that carnivore would pick up. I wonder how much noise that would add to the system. I wonder how many people I could get to run it, as tempting as it would be I wouldn't write a virus, but I bet there are enough people who care enough to run it. Of course it would be only to help the government better their filters, that's the ticket.