A single sentence from a new book by Judge Richard Posner of the U.S. Court of Appeals for the Seventh Circuit recently created a firestorm around the Internet. In Reflections on Judging, Posner wrote, “I plead guilty” to having authored the majority opinion in Crawford vs. Marion County Election Board, which, in 2007, affirmed Indiana’s voter identification law.

That decision became a basis upon which federal courts nationwide have upheld various photo voter ID laws, despite their clear disproportionate impact on voters of color, women, elderly and poor voters, and other vulnerable citizens.