Back in the early 1970s, my older brother wore a button that simply said, “Keep Nixon Healthy.” He said people often commented on it, usually thinking he was supportive of Mr. Nixon, and wanted him to be well. But for my brother, as a liberal, the button had a very different, if somewhat droll and ironic meaning. Readers of a certain age will recall that Mr. Nixon’s vice president was a rather undistinguished (and later indicted) gentleman with the unlikely name of Spiro Agnew. Mr. Agnew was the former governor of Maryland and was not considered…how shall I put this… the brightest bulb on the Christmas tree? Not the sharpest knife in the drawer? Kind of dumb?