With Antonin Scalia dead, Clarence Thomas is somewhat arguably the most conservative judge on the Supreme Court. Appointed by George H.W. Bush in 1991, Thomas has been on the court a long time. However he just recently went ten years without asking a single question during arguments before the court. The Supreme Court goes through many case some of which are immune to modern politics, but I'm not surprised he sits there silently. I wouldn't doubt he's a man who's made up his mind on the case before hearing all the facts.