I swear, every time I hear Newt Gingrich spout off, I think of “Caste: The Origins of Our Discontents,” the brilliant 2020 book by Isabel Wilkerson about the eight core beliefs that uphold a caste system. The pillar of “inherent superiority vs. inherent inferiority” is the one that keeps Gingrich on TV. Conservatives have known he was full of it since his first campaign in 1974.