What if it was him or Billary?
Republicans in Congress would fight the evil carpetbagger every step of her way. We'd see filibusters, lots of conflict. It could be good. I tend to think that the less lawmaking happens, the better off we are.
With another RINO in office, the pressure would be on Republicans to go along to get along. Some, like Tancredo, with whom I don't always agree, but whose chutzpah I sure respect, wouldn't care. But the mass of congresscritters would do as they were told by the RNC. And the Democrats, along with statist RINOs like McCain, would happily "work across party lines" with Guiliani, to undermine what rights they could.
So, as much as I think we'd be better off if Billary defected to Bolivia, I think we might end up in a better place with her as President than Guiliani. Neither option is attractive.