As he worked to unleash the Republican Revolution, Newt Gingrich famously crafted a lexicon to disparage Democrats. Among his favorite 1990s buzzwords: corrupt, pathetic, and sick. With C-SPAN cameras newly installed in the House, he spoke to an empty chamber, believing his words would find an audience of conservatives who wanted to “speak like Newt.” He packaged this new vocabulary in a memo titled “Language: A Key...