It really doesn’t matter (delegate-wise) who wins the PA primary. None of the delegates are bound. They are all free to chose who to support at the convention.
That's what makes it interesting. It's a beauty contest (in the midst of a bunch of WTAs). So being non-binding, does that help Santorum or Romney? Thinking it's the former, if he promotes that wisely, or if that aspect even translates downward to PA voters...