Look North to see what can happen when political parties no longer represent what their namesakes and philosophies intend. The conservative party here in Canada would be considered liberal in the U.S., and the Liberal party would be considered outright socialist.
Always be vigilant about not just your opposition, but also about the party you're casting a vote for. The enemy of your enemy isn't always your friend.
Note: I'm not saying this is actually what's happening with the Republican party, as I'm definately out of the loop on most of the bills and such that they pass day-to-day, but I have noticed that the RINOs have gone beyond a mere handful. They're a bloody herd.