I read his article and asked myself if I couldn't have written much of it.
Santorum--if the GOP nominee--will lose, and he will take down others with him. In the end, I'm sure a certain slice of the Republican Party will be smug and content in their newly ideologically pure (and perpetually minority) party.
However, every issue that matters to them for decades to come, will go the other way. You want to see the "muddled middle" become un-muddled? Nominate Santorum.