Rafaela Tijerina first met la señora at a school in the town of Lost Hills, deep in the farm country of California’s Central Valley. They were both there for a school board meeting, and the superintendent had failed to show up. Tijerina, a 74-year-old former cotton picker and veteran school board member, apologized for the superintendent—he must have had another important meeting—and for the fact that her own voice was faint; she had cancer.