Usually the nominee doesn't win a majority of primary votes because there are so many candidates.
And Romney did win a share of voters who describe themselves as conservatives.
If there'd been one superior conservative candidate he or she could have swept the others aside and Mitt Romney wouldn't have won, but there wasn't so he did.
But would Gingrich step aside for Santorum or Paul? or Santorum step aside for Paul or Gingrich? Was any of those candidates really top-notch?
And if Gingrich was the nominee wouldn't people be saying right now that he lost because he wasn't a true conservative?
Oh, I have little doubt that the drubbing that Gingrich or Santorum would have gotten would be blamed entirely on Karl Rove.