Immediate attack on the parent poster's political affiliation... obviously the party that he belongs to (judging by this one issue, even though I don't know where he stands on others) is absolutely full of complete psychos and want to do all kinds of other bad things that will destroy civilization as we know it. And they completely fulfill the most extreme version of every stereotype about them.
Immediate attack on the two-party system. Accuse Democrats and Republicans of being exactly the same in every way. Baseless claim that Libertarians offer the only meaningful solutions stemming from my mistrust of the horrific lurching monstrosity called "government," whose true functions, in actuality, I only vaguely understand.