Santorum is "unelectable" in the same way as Sarah Palin. Since they are so extreme, there will always be a small, dedicated swath of people who like them, and they can even get enough local support to get elected to an office, however once they hit the national stage they're toast.

Also, I completely agree it is ludicrous how the Republicans chose to nominate someone less popular than McCain and are now acting surprised that he got fewer votes. Gee, no one could have predicted that!