Hillary Clinton, who has kept a relatively low public profile since losing the presidential election two months ago, on Sunday showed up at the final performance of the Broadway revival of “The Color Purple,” reveling in the story of a beleaguered woman who triumphs over the oppressive men in her life (and, along the way, discovers a love for colorful pants). Mrs. Clinton, accompanied by her husband, former President Bill Clinton, and their daughter, Chelsea, received several ovations from the sold-out audience as she arrived, and then another round of applause when she was acknowledged by the cast after the...