The mainstream media is awash with criticism of Republicans, but it always denounces the wrong people. If you listen to the media, you'd think the GOP is being wrecked by people like Jim DeMint, Allen West, Sarah Palin, and the Tea Party. In other words, the real problem with the Republican Party is supposed to be the responsible conservatives who put their country first, want to keep us from going broke, and actually represent the people who elected them. Wrong answer, buddy. You want to know the types of Republicans that are hurting the GOP?
1) The Sell Outs: Liberals love pundits who claim to be conservatives, but tell them what they want to hear about the Republican Party. So, if you have no integrity, like say David Frum, David Brooks, Meghan McCain, Joe Scarborough, or Kathleen Parker, you call yourself a Republican, but spend most of your time criticizing your “own side.” Nothing on the Left ever seems to get you as agitated as the things the people "on your side" do. Liberals get a pass for the same sort of comments that infuriate you when it comes out of the mouth of a conservative. That's because when you're a performing seal for the Left, you have to be tame and balance a ball on your nose just the way the Lefties like or they might stop giving you fish.
2) The Purists: Of course, you can go too far in the other direction, too, like the members of the "I'm more conservative than you" club. These are the people who tell you there's no difference between the Republican Party and the Democrats. They take their ball, go home, and don't vote in the general election when the candidate they support doesn't win a primary. Issues like electability, the chances of actually passing legislation, and what the general public wants are never taken into consideration. This is how you end up with people who think we can do better than Scott Brown (71% ACU rating) in Massachusetts or that we can just decide to never raise the debt limit again, even though we've already spent all of the money. If you want to have it your way, go to Burger King because you're not ever going to get everything you want in politics.