In an article by the title of We're All Gun Nuts Now, John McCormack looks at the Democrats uneasy relationship with the Second Amendment:
Democrats have run away from gun control because they think it's a major reason they lost swing states in the last two presidential elections. As Democratic congressman Barney Frank said in 2001, "Unlike gay rights, environment, and choice . . . Democrats were disappointed when a pro-gun control bloc did not appear."
The article also talks about McCain's anti-gun voting record on certain issues.
Like Obama and Clinton, McCain favors closing the "gun show loophole," which allows private individuals, unlike licensed gun dealers, to sell their guns without performing background checks. This has a decent chance of becoming law in the next couple of years.