Margaret Dumont whose best-known character was as Mrs. Teasdale in the Marx Brothers movies; Chatsworth Osborne Jr.; of the Dobie Gillis show; Richie Rich of comic-strip fame; the Howells of Gilligan’s Island; and countless others. They're stock characters in American culture. Rich, society people who speak with exaggerated accents, look down their noses at the masses, and take their privileges as being due to their superior virtue. This is a particularly American response to class difference: laughing at these pretenses. Communist cartoons portrayed fat, top-hatted plutocrats in hope of stirring a proletarian revolution against privilege; Americans ridiculed its pretensions. Yet...