I think most of them didn't come out for Romney because he's a true blue flaming liberal and has the track record to prove it.
I cast my NY throwaway vote for president for a third party candidate and did catch a lot of flack for it. However, I totaled up all the third party votes, added them to the Romney vote and there still wasn't anything near enough to come close to keeping NY from going to obama.
OTOH, when I knew my vote would count for something, like our House vote, it was conservative. I also made a vain attempt at getting Schumer and Gillibrand out and it wasn't because they were Catholic.
OTOH; the public record shows that he's been deceived by a religion than can be easily shown to be a false one.
Many did NOT this kind of a man running the country; unable to discern between fact and fiction.