Yes, it is; it's called being prepared.
Do you have a problem with that?
Is it possible you don't recognize the magnitude of this meeting and those who might disagree with it?
Perhaps the more appropriate question would be "Does the Constitution have a problem with killing protesters?" and the answer is unequivocably 'yes.'
Just because I disagree with a bunch of hippies doesn't give me the right to kill them. And that is even more true with the government.
Be careful about what you endorse, under a Kerry/Hitlery administration they may be bringing in the body bags for a freep-fest they don't like.