As Democrats and Left-wing “progressive” anti-gun activists continue to push for gun bans and other erosions of the Second Amendment following the terrible mass shooting in Las Vegas on Sunday, it is well to remember that, once upon a time, a pair of notable Democrats did their best to ensure that kind of violence occurred as often as possible south of the U.S. border. Early in President Obama’s tenure, he and Attorney General Eric Holder cooked up a scheme to send thousands of U.S.-based “assault weapons” — that is, semi-automatic rifles which cosmetically resemble real assault weapons — into the...