The Washington Post has a new motto, displayed right below the paper's logo on its homepage: "democracy dies in darkness." It's a new thing for the paper, which never had a motto or slogan in its 140-year history. Not through World War I, or the Great Depression, or World War II, or the Cold War, or Vietnam, or Watergate, or the War on Terror, or — or anything. Through all that time, including the period when the Post was lionized for shining light on Watergate, did the paper have a motto. But now, it is "democracy dies in darkness." The...