US Constitution, Nothing but an 18th Century Document

Here's what Judge Richard Posner, of the Seventh Circuit Court of Appeals, thinks of the Constitution of the United States (as quoted by Glenn Greenwald):

The Constitution is nothing but "an 18th Century document," Posner complained, and "the notion that [the Founders] had the answers to 20th Cenutry problems . . . is, I think, wrong and dangerous."

Somewhat more sophisticated than our President, who said, "The Constitution is just a goddamned piece of paper," but not very different in effect. Isn't it nice that those who are sworn to protect and defend the Constitution and those who are appointed to interpret it think it's just an 18th century document that has no relevance to modern America?