Here, a senior English professor at a public Colorado university wants to bring professional Obama campaign workers to come to his, and other, classrooms to talk to the students, register them to vote and ask them to help re-elect Obama by joining his campaign.
Here, a Chronicle on Higher Education article on the incident from the man who broke the story and conducts an on-going fight against political bias in the classroom by any party.
http://chronicle.com/blogs/conversation/2012/08/28/beware-of-partisan-politics-in-the-classroom/