Or, on the flip side of your argument: Let's nominate another Bush, McCain, or Dole and have more RINO's damage the conservative agenda with their version of big gub'ment spending. In fact, the only thing worse than a tax-and-spend liberal is a person who cuts taxes and then outspends the democrats (like Bush did and McCain and Dole would have).
I think there are very winnable, true conservative candidates out there.
Quite possibly there are, but no one's ever heard of them. And if you think that a white man is going to beat Barack Obama or Hillary Clinton in 2012, you're living in the 20th Century.