I really don't see anyone from the Democratic party mounting a serious threat to Obama, but on the other side less they bring Ronald Reagan back to life, there really isn't anyone so far that warrants any consideration.
Exampe "A" Mike Huckabee:
"I believe it's a lot easier to change the Constitution than it would be to change the word of the living God. And that's what we need to do is to amend the Constitution so it's in God's standards rather than try to change God's standards so it lines with some contemporary view of how we treat each other and how we treat the family."
All that is really left is if Romney runs???