The Second Amendment is indisputable.
It is the foundation of freedom.
Now that Sotomayor is a justice (HAH - what an oxymoron that is), she'll help it go down in flames.
And why has the NRA presented a brief? The NRA in the past had contributed to some very poor, prohibited legislation.
Better than the NRA is Gun Owners of America and Jews for the Preservation of Firearms Ownership. But then that is only my opinion, after following this issue for the past 20 years+/-.