He better as he will alienate social conservatives, fiscal conservatives, and Regan republicans. He may do well in the east, but in the south and middle America, a big New York City immoral moderate won't play well. But then he may get enough anti-hillary votes to win, but he surely wont get enough pro-rudy votes.
I would imagine that his running mate will make up for any perceived shortcomings.
And FYI...Rudy IS a fiscal conservative and VERY hard on crime and criminals, so many people will find common cause with his stances on those things.