Censorship is the state determining what can and can't be said.
It is not censorship, nor a 1st amendment issue, to say "stop posting stupid dreck that you read on infowars' at the daily paul site. Nor is advocating that position advocating censorship. For people who purport to love the Constitution, some understanding of it is necessary.
And while Ron Paul supports SOME well proven theories that one can fairly call conspiracies, he is also very silent on a whole lot of others. For example, I have heard him talk of the NAFTA highway, but he has never come out supporting the 9-11 truther movement. In fact, during an interview he scolded a newsman for suggesting that "Bush knew" in advance. I'd be willing to bet there are a few "Bush knew" proponents here. When Ron Paul supported something there was empirical evidence of it, not wacked out speculation which may or may not be true.
"Two things are infinite: the universe and human stupidity; and I'm not sure about the the universe."-- Albert Einstein
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