From Inside Higher Education:
Sporting an Obama or McCain button? Driving a car with one of the campaigns’ bumper stickers? You might need to be careful on University of Illinois campuses.
The university system’s ethics office sent a notice to all employees, including faculty members, telling them that they could not wear political buttons on campus or feature bumper stickers on cars parked in campus lots unless the messages on those buttons and stickers were strictly nonpartisan. In addition, professors were told that they could not attend political rallies on campuses if those rallies express support for a candidate or political party.