KLBJ in Austin played that tape several times today and the 0 bummer supporter / voter said that people got arrested for things they said about Bush. I never heard about those incidents.
I know they had a couple of incidents in CO with teachers when Bush was president, one just up the road from, and they were very vocal to their classes about how they hated President Bush. One teacher was Jay Bennish at Overland Highschool in Aurora that gained nationwide attention. Another one that gained nationwide attention was a teacher in another CO school that had a bumpersticker and/or button that said "not my president" if I'm remembering correctly. I don't remember them being hauled off or losing their jobs.
Rosen identifies “Not My President” Teacher (Martha Swisher)
http://www.freerepublic.com/focus/news/857511/posts
FR EXCLUSIVE: Class Syllabus of Bush-bashing Colorado Geography Teacher Jay Bennish
http://www.freerepublic.com/focus/f-news/1588714/posts