From National Review Online:

Stop me if you’ve heard this one before. In 1791, the Founding Fathers placed into the U.S. Constitution a set of ten amendments that we refer to collectively as the “Bill of Rights.” Among them was an innocuous measure designed to protect state militias against federal overreach. Until the 1970s, nobody believed that this meant anything important, or that it was relevant to modern American society. But then, inspired by profit and perfidy, the dastardly National Rifle Association recast the provision’s words and, sua sponte, brainwashed the American public into believing that they possessed an individual right to own firearms.