[Phantom Lord]

In fact, one must be reasonable afraid of the actual threat of physical harm

There are people in jail today for sending letters to the president claiming they were going to cause harm. The letters never made it to the president, so there is no way that the president could be "reasonably afraid" of actual physical harm. But regardless, they are in jail.

[graf008]

That is the President - See http://www.law.cornell.edu/uscode/18/871.shtml

This is only Rumsfeld. And we don't take all threats seriously - http://usgovinfo.about.com/library/weekly/aa040398.htm Has some good info on this.