My favorite on P&N and politics in general are the false dilemma arguments, and it seems to be the most common by far. I actually didn't know the name, but I've seen it quite a lot. In fact, a thread I started a little while ago was on that topic. The basic fallacy is that there are a limited number (usually two) of options to pick from, and if you don't pick one option, you must pick the other. This does actually work, as long as you first show that there are indeed only a limited number of options. This step is almost always implied, usually without any supporting evidence.
I don't have a direct quote (mostly because I'm too lazy to look for it), by my favorite recent example of this is "You don't support Bush's approach to the war in Iraq, you want us to pull out immediatly and let the terrorists win."