If data is right and it pretty much is that ~80% of US population is for some sort of a gun control, then passing Constitutional Amendment would be a breeze. I

If data is right and it pretty much is that ~80% of US population is for some sort of a gun control, then passing Constitutional Amendment would be a breeze. If majority of these 80% of people were single-issue voters and this was THE thing they cared about, it would take few election cycles but eventually this issue would carry enough clout that things would get done... of course it never will be though...