Back in 1996, President Clinton was giving a speech at OSU (Ohio State University). Some Dole-Kemp supporters in the audience started heckling him, and he not only responded to them, but supported their right to voice their opinions:
Wait, wait. Wait a minute, wait a minute. Just listen to them. Wait a minute. Why are they screaming like that? We heard you. Now, how about the First Amendment. We heard your message, now you listen to ours…. I welcome anyone to these rallies, and I welcome you to theirs. I hope you will never go to theirs and stop them from speaking. I believe in free speech at every university in america.
Fast-forward to 2002. President Bush is speaking at OSU. A peaceful protest — one not even involving any heckling — was being planned, consisting of nothing more than those who wished to protest turning their back on Bush during his speech. However, upon entering the stadium, students were threatened with expulsion and arrest on charges of disturbing the peace if they participated in the protest. One online eyewitness account describes one protestor being removed from the arena after turning their back.
So much for the first amendment, eh?