I agree it's got to be Rudi G. True, he's not a social conservative BUT he is an economic conservative, he's pro-free enterprise and he did a heck of a job as Mayor of NYC. I think he's the only one who can beat the wicked witch.
I look for him to run in the primaries and to modify his views on affirmative action and abortion, taking these views slightly to the right. I think he knows he has to do this to get the nomination.
He supports killing babies. That makes him a non-starter.
What do you plan to do about all the people in this country who believe in the Bill of Rights and the 2nd Amendment who would no more vote for Rudy than Hillary? The Republican party minus those people who would stay home would certainly mean Hillary would not just win, but win big.