The aftermath of Sandy Hook was the closest Congress has come in the past decade to passing any meaningful changes to the nation’s gun laws, but when a modest bill to strengthen background checks came to a vote in the Senate, only four Republicans voted for it, while four Democrats, none of whom are still serving, voted against it. Since then, there has been only frustration and anger after mass shootings in places of worship, in stores, at a concert, at a nightclub, at a yoga studio and in schools, making many fear that anyplace in the United States could be next.