"I'm quite worried if Hillary wins the primary."
I wouldn't be concerned at all if we nominate the right candidate. A "red state", socially conservative leader with very strong personal morals and conservative principles. And then paint Hillary as the New York liberal, radical feminist, unprincipled carpetbagger that she is. And, if you had somebody with true conservative principles, you could make fun of her changing views on immigration and her other "sharp rightward turns." And then go out there, and clean up with every socially conservative voter, blue collar men, and the anti-Beltway crowd.
But, running Giuliani or McCain, it looks like she a clear shot. I don't understand how Giuliani, for example, would differentiate himself from her. He has bad morals too. His positions are very similar, and she will be to his right on several issues (immigration, etc) by 2008.
Giuliani is dead, due to that police chief fallout - so don't worry about him. McCain still needs to show, in some way, that he is a Republican, so he's unlikely.