It is not a search engine's responsibility to police our neologisms. Santorum is a word now used by the common public, and it requires no editorializing by third parties. As the original article points out:
The news is better for searches for Rick Santorum's full name, rather than just the word "santorum." In that case, his official site ranks tops.
So in other words, if I'm looking for a person, I write the person's name in and find the person. If I'm looking for a thing, I type said thing in and find it.
For example, would anybody be annoyed if a google search of the word "houston" showed Houston, TX as the first hit, instead of Whitney Houston?
Now as to why Santorum and santorum came to be connected is another matter. But that's something for a different conversation, which the columnist fails to grasp.