First I must say this:
GET INVOLVED WITH YOUR STATE LEGISLATURE ON GUN ISSUES. More on that in a little bit...
Obama or Hitlery would love to try it but at best they can hope for is some gun control and maybe another half assed "assault weapons ban" like the 1994 ban. Democrats still blame Gore's loss in 2000 on their Gun Control stance. Since then, they have tried as best they can to shut the hell up about it. That doesn't stop the hard core gun grabbers like Carolyn McCarthy from talking about it but as a whole the Dems shut up about it.
Juan McCain is a piece of trash but he isn't a gun grabber. He isn't a huge fan of the 2nd, but his own political power is all he's interested in. He isn't interested in making some socialist utopia like Hitlery or Obama. He's smart enough to know all out gun grabbing will lead him right back to an old folks home here in AZ where he belongs so he won't try it. He may try some "gun show loophole" bullshit or trigger locks or maybe even another AWB ban but he will probably be smacked down by the true Republicans as soon as he starts to talk about it.
Getting involved at the state level:
Now to what I posted at the top. Look at what gun control has occurred at the federal level since Bush. Thankfully, none really. Some states have passed more of their own gun control, some have passed less. More states have CCW laws now which have reduced crime and allow citizens to legally carry firearms concealed. I've been a supporter of a group here in AZ called the Arizona Citizens Defense League. They do a lot of great work with the state legislature here. Over the past few years they have been successful in improving the gun laws. Eventually it looks like we might even be able to get rid of the need to have a CCW permit in the first place (back to the real 2nd Amendment!). I'm only aware of one other state with such an organization and that's VA. If you are not in AZ or VA try searching Google for any gun rights groups. If there isn't any such groups, start one! Then find your state legislatures web page and contact your reps and find out if they support the 2nd amendment. I email a lot of the reps and Senators here in AZ and they respond by email all the time. And most of the time it isn't just some canned response you get back when you send an email to a federal level Senator. You really get a response from a real human that most of the time IS the actual Senator or Representative you emailed. Try working with the ones that support the 2nd Amendment. Go to gun shows to find other people who want to help improve the laws. Have them send emails. Put the pressure on. Most of the state legislature only hears very little from the public so they just do what they think is best. If you get a group of people sending them emails on issues that will soon be the only voice they hear on the topic of guns and they will respond because they want to keep their damn jobs! Here is a link to the AZCDL:
http://www.azcdl.org/
I saw a list of the proposed gun laws this year here in AZ. I saw maybe 3 bad ones, and they were so retarded that even if they passed it wouldn't really effect anyone. Stuff like you can't take a firearm within 75 feet of a polling place. You already can't have one inside of the polling place... So what? But there was a hell of a lot more than 3 good bills! From what people have told me this is a huge turn around from 10 years ago when the exact opposite was true.
If you're in a state like CA or IL or NJ, well, I'd say you are better off moving to a free state. Some states are probably a lost cause because they want to become socialist. There's no stopping some of them. But most states have plenty of hope.