Well, to start off I'd like to say that most candidates try to embody their party, and the Republican party has a very xxSJ persona. But we have to remember that the Republican party appeals to people of all types for a variety of reasons.
So Romney could very well be an ENTJ, just not a very bright one. He doesn't seem ESTJ to me. I definitely get ExxJ from him. I don't think he's a feeler, but hey, we don't really know him.
Edit: I'm VERYSUPERLIBERAL but I try to avoid bias when I have enough self-control to do so.