It will be interesting. My theory is that everyone knows Rudy's position on social issues, his marriages, his ties to Bernie Kerik, and no one really cares. Most Republicans...indeed, most Americans...are predisposed to support Rudy. He has a lot of voters' good will, and they want to believe in him, and give him the benefit of the doubt. Normal smear campaign stuff will likely not stick, and could rebound to smack the flinger in the face.
Cute, but wrong theory. Very few do know his slimey side, but when they do, they no longer support him.
For many Americans, every time they look at Rudy they see 9/11. He doesn't have to say a word about it.
It's not a bad thing.