They're all so bad there is hardly any difference between them.
Hilary is a political creature and yes, she knows gun control can cost her. Still, if the Congress passes something like a new AWB, can you really see her vetoing it? I can't. She is enough a political creature that yes, she will say or do anything to get elected, but I think she's a gun control true believer at heart.
I agree Obama is a product of the Chicago machine and I'm sure dreams of a full ban and confiscate policy. His only regret signing the McCarthyite AWBII is that for him, it doesn't go far enough.
Rudy is of the same ilk; it is more a result of their big city, nanny government, social meltdown mindset than a Republican or Democrat issue. Rudy might feel some pressure from his party to moderate his anti-gun crusading, but again, probably not enough to veto the latest McCarthy abomination.
Usually I reject the notion that there's no difference between Republicans and Democrats on gun control - there is definitely a difference between Bush and Kerry, or Bush and Gore, for instance. Bush isn't all I'd want him to be, but he's nowhere near as bad as Gore or Kerry who are true gun control crusaders.
However, if Rudy were the nominee, I would for that election agree with the "they're all the same; vote for a whacko fringe party" folks.