First let’s start with the definition of bigot from dictionary.com:
a person who is utterly intolerant of any differing creed, belief, or opinion.
With Santorum’s intolerance of LGBTs and their rights I think he fits the definition perfectly. And by extension anybody who is willing to vote for him is willing to vote for a bigot.
Electing Santorum would like spreading a little Santorum all over the world.