Our well regulated militia. Isn't.

"Conservatives often embrace “originalism,” the idea that the meaning of the Constitution was fixed when it was ratified, in 1787. They mock the so-called liberal idea of a “living” constitution, whose meaning changes with the values of the country at large. But there is no better example of the living Constitution than the conservative re-casting of the Second Amendment in the last few decades of the twentieth century."

Jeffrey Toobin, "So You Think You Know the Second Amendment," The New Yorker, December 17, 2012.