JACOB SULLUM: “Universal background checks” could unjustly deny millions of people the right to armed self-defense. “Although Obama did not mention that little detail last week, The Washington Post reported earlier this month that the administration was ‘seriously considering’ creating a system that would “track the movement and sale of weapons through a national database.” Second Amendment supporters historically have opposed gun registration, fearing that it could ultimately lead to confiscation, something that has actually happened in places such as Canada, Great Britain, Australia, California, and New York City.”