From the Chronicle of Higher Education:

In response to an Illinois law prohibiting state employees from engaging in political activity, a group of students and faculty members at the University of Illinois at Urbana-Champaign held a campus rally on Thursday in support of the Democratic presidential nominee, Barack Obama, the Chicago Tribune reported this morning.
In addition to a ban on faculty members’ wearing campaign buttons or T-shirts, the governor’s Office of Executive Inspector General told the Tribune that the law may forbid students to participate in political rallies. “Anything that benefits a political campaign is prohibited on state property,” said Gilbert Jimenez, deputy inspector general.