Zoe,
Good point, and I think in the bit you quoted from me I wasn’t articulating my point well. It’s not that I don’t think there’s a place for criticism in discussion, it’s that anything that’s going to be “passive and routine” (according to Kimstu) ought not to be thinly veiled insults to students’ beliefs. “Dump Bush” on a poster teaches nothing. All it says, without any other context, is, “Bush is a poopyhead,” which is not a constructive jumping off point for discussion or education.
I guess, the more I talk about this, the difference (and maybe this is what y’all have been saying) between what is acceptable and what is not is this: Everything I do at the school is intentional. If and when I talk about politics, I do so in a manner that’s mindful of the students’ learning process, their opinions, and their relationship to me. Life is learning, and when you’re in a school it is even more so. Nothing I say or do is without purpose. Likewise when talking about religion, sex, violence, drugs, or any other ‘issue’ that is an integral part of society, the school, media, and the kids’ lives. To say anything without consideration for them is criminal.
So, maybe I agree about the posters. Why are they there? What are they teaching? Are they truly informing about a certain perspective, or is the teacher just throwing his beliefs and opinions out there with no consideration of the educational implications of doing so? I don’t know the answer, but maybe that’s the question that should be asked of any situation.
Kimstu,
Points well taken; see above.
WhyNot,
But if there wasn’t debate on a message board, what would I do on a Saturday afternoon!?!?!? 
Seriously, though, I’d have to call ‘cite’ on the ‘illegal’ part. I mean, I understand conceptually church/state seperation, but are there legal cases where a teacher who had a religious poster up in his/her room has been shown to have broken that law?
Absolutely. But, from some perspectives, it’s just a belief, and a wrong one at that. Perhaps from your scientific perspective it’s a theory, but, hey, you can think whatever you want, it’s all just mumbo-jumbo anti-Christian ignorance.
The point being, that truth in public education is in the eye of the beholder. You concede politics in the context of teaching current events/democratic process, but I would say that any time an educator talks about politics he or she is teaching about current events, whether it’s a lecture of dates and figures or a discussion on the validity of Bush’s reasons to go to war, or whatever. Just because it’s not in the curriculum doesn’t mean it ought not be tought.
SteveG1,
Yeah, I cited the pit thread, and I kind of wish I hadn’t. It’s what got me thinking about this this week, but that incident isn’t really what I’m interested in.