...Paul Clement, the former U.S. solicitor general, made his resignation letter public—a decision that telegraphs the size of rift between Clement and his former employer, the well-known Atlanta-based firm King and Spalding. He immediately joined a Washington-based firm, Bancroft, in order to continue representing the GOP. House Speaker John Boehner had signed up Clement and his firm to argue for the constitutionality in federal court of the Defense of Marriage Act after the Justice Department had determined that it would no longer defend the law’s legality, calling it a violation of equal protection principles. Clement and King and Spalding were...