Rep. Keith Ellison, a Minnesota Democrat newly elected to Congress, took his oath of office with his hand on the Quran, a copy of Islam's holy book once owned by the nation's third president. No one would have been more proud of the moment than Thomas Jefferson, who pointedly believed in religious freedom, not religious tolerance. Ellison, who was born in Detroit, converted to Islam in college. He is the first Muslim elected to Congress, an interesting footnote at a time the first female speaker of the House is installed. His decision to swear allegiance to his office, country and...