From Law Clerk to U.S. Senator?

Chris Coons, the Democratic Nominee for the U.S. Senate seat formerly held by Joe Biden, is a former law clerk on the U.S. Court of Appeals for Jane Roth of the Third Circuit. Coons is a heavy favorite to win his race and become a U.S. Senator. Which prompts a trivia question: If he wins, will Coons be the first U.S. Senator who was once a judicial law clerk?