You'd have to be pretty thick to believe that all those who voted left or right supported pro- or anti-gun positions, as if it were the only issue on voters' minds. Or that the Second Amendment is not an enduring debate. Or that those who supported Obama, Clinton and that avowed socialist Sanders from wildly radical Vermont were all anti-gun, and Clinton's 3,000,000 more votes than Trump (squeaking by on a College vagary of a total less that a college football stadium across three states) were all anti-gun, too! Guns were a far-down electorate concern.
King, this constant reference to the popular vote, by you and by so many other people, is meaningless. It is simply their system. Just as Trudeau has a majority "mandate" with 39.4% of our vote in 2015. Just as Harper had a majority "mandate" with 39.5% of the vote in 2011.
What is telling in these circumstances is that those on the losing side (Dems in the US in 2016, Liberals in Canada in 2011) scream about the unfairness of it all. But are quiet as church mice when the shoe is on the other foot. (Canada 2015).
Please, whatever point you are trying to make (and there may be a good one in there) don't mess it up with meaningless drivel that, when drilled into, actually diminishes the strength of your argument.