I do not affiliate myself with any party, I have voted Democrat and Republican over the years. This is because of the pattern of one party (or side) criticizing the other for basically doing the same sort of thing their party (or side) side once did. One immediate example (which I've mentioned in other posts) is conservatives talking about the debt yet not taking a strong stand on military waste, lest they be deemed unpatriotic. On the other side Obama has been very disappointing on some things (not closing Gitmo, or the ineptitude and borderline deception of his administration's response to the BP oil leak situation as revealed in the recent Rolling Stone article) that his party would have reamed Bush for.
Another symptom of this mindset is when those on the right or left play the victim card as if whatever administration is in power is trying to single them out. A big example of this a little while back was the outcry about the Homeland Security report on right wing extremism, which led to tons of conservatives complaining that they would be labeled threats because of their bumper stickers. The thing that no one seemed to report was that Homeland Security had also put out a report on left wing extremism and cyber attacks.
Party affiliation seems to be less about rights and liberty for all and more about reaping spoils for whatever specific segments of people your party counts as it's base and then attempting to pass laws to screw over those that aren't part of your base. Whether these laws are about guns, drugs, gay rights, or any number of issues.