Respondent public high school student (hereafter respondent) delivered a speech nominating a fellow student for a student elective office at a voluntary assembly that was held during school hours as part of a school-sponsored educational program in self-government, and that was attended by approximately 600 students, many of whom were 14-year-olds. During the entire speech, respondent referred to his candidate in terms of an elaborate, graphic, and explicit sexual metaphor. Some of the students at the assembly hooted and yelled during the speech, some mimicked the sexual activities alluded to in the speech, and others appeared to be bewildered and embarrassed. Prior to delivering the speech, respondent discussed it with several teachers, two of whom advised him that it was inappropriate and should not be given. The morning after the assembly, the Assistant Principal called respondent into her office and notified him that the school considered his speech to have been a violation of the school's "disruptive-conduct rule," which prohibited conduct that substantially interfered with the educational process, including the use of obscene, profane language or gestures.…