Why did he lose credibility? By pointing out the fact that Christine O’Donnell didn’t have a chance of winning? So in today’s world, pointing out the truth makes you a rhino?
No, being a RINO makes you a RINO
Yes, pointing out the truth makes Rove a RINO. Nobody wanted to hear that conservative don't win in liberal states. Lots of "conservatives" prefer rat control of the government to compromise. They are all very happy O'Donnell ran so they can continue to bitch about RINOs while they wash their hands of their complicity in letting the rats run the US Senate.