Fun article, but one thing to note is that taking a single sample at a grad school in Washington, D.C. won't give you a reliable model about the entire country.

Fun article, but one thing to note is that taking a single sample at a grad school in Washington, D.C. won't give you a reliable model about the entire country. I don't think that's true anywhere in the world, especially not in a big, diverse country like the U.S.