Via How Appealing comes a link to this unanimous opinion of the Ninth Circuit in Flint v. Dennison. From the conclusion:

By creating a student election process, the University of Montana has opened a limited public forum dedicated to allow campaigning for and election to leadership positions in student government. The University’s purpose in opening such a forum is to provide student candidates and student voters a certain type of educational experience. We hold that imposing an expenditure limitation on student candidates is viewpoint neutral and serves to effectuate the purpose of the ASUM elections. We therefore affirm the district court’s summary judgment in favor of defendants.