Well, for practical purposes one. Newt is out. Ron Paul is still lurking, but not much else. It was interesting to watch Gingrich and Santorum cancel each other out by splitting votes.
Not a real Newt fan here (too much baggage), but he is definitely a big ideas kind of guy which was refreshing. Mitt Romney's campaign rhetoric is too vague to know if he can see the big picture or not. I'm hoping his experience in business, where you have to be able to see the whole thing to be successful, indicates that he can. We could use that right now.