I think a lot of people are missing a very real point. If Obama gets into the white house he will not have to change the second amendment. As the justices for the supreme court retire he has to only elect candidates who see things from his perspective. Then they can 'interpet' the second amendment as they see fit.
As the founding fathers stated, 'either the amendments stand together or they shall fall apart separately.'
The only thing good Obama and Biden would do for the peoples right to own a firearm is if they do not get elected.
Think gun control works...look at England and Australia. How much has crime risen in those countries since their total gun bans?