I think there is some misinformation in this article, the NEA is not a "union", it is a professional teachers association. Secondly, the NEA has to have a seperate entity, such as NEA PAC to endores Candidates. I am not sure why NEA is said to be the endorsers of John Kerry. It should be the NEA PAC Endores John Kerry.
Your understanding and use of "nuance" screams that you are very liberal. Our school system is a failure. I think most involved support it because they would fail themselves in private industry. Shameful.