When San Francisco middle school principal Lena Van Haren saw which kids on her campus had been elected to the student council, she was disturbed at the lack of diversity among the winners. There were no Latino or black candidates chosen for the top four spots. Her concern for a representative student government, given the preponderance of students of color at Everett Middle School in the Mission District, may have been understandable. What she did about it, however, swiftly raised a different kind of alarm. Van Haren decided to withhold the results of the Oct. 9 election for more than...