Take a look at the writeup on him in Wikipedia and you will see how the Media and other libs will attack the guy.
No doubt. They will attack any GOP candidate. It's the way the candidate is willing to respond. Bush got past his own demons. But how will McCain react? He has a bad temper that can come out pretty loony and Rudy has his numerous affairs, leftist stands on pretty important issues to many conservatives(abortion being murder and not compromising), Newt being an incredibly unpopular Speaker who left in disgrace and hypocrisy with his his actions of cheating and not being able to live up to a decent standard while in office. Those are insurmountable. These accusations against Hunter are gutter politics and will and would be responded to. He is very strong and they would fear that undoubtedly.
Liberals trash all conservatives on wikipedia. You should have seen george allen's wikipedia page, trolls descended on that page like a fly to shit.