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Smear campaigns are, in fact, standard. Swift boat veterans, Birthers, Abortion doctors as baby killers, comparing homosexuals to pedophiles are all examples of exactly this sort of behavior on the right. Similar examples exist on the left, but you can look them up yourself.

It is a new meaning. It has appeared in numerous publications, and has achieved a pretty wide spread. The fact that it was started as a "propaganda tactic" is immaterial.

Advocating pedophilia? I don't know why I'm feeding such an obvious troll. A group of people called someone who they had a (justified) dislike for a bad name and it stuck. Santorum has compared gay sex to bestiality and pedophilia, I think both of those associations are far worse than being associated with the "frothy mix". Giving someone an insulting nickname is a bit childish, but it's harmless and in this case, a response to Santorum using essentially the same tactic to attack the gay community.