It works for the families who are involved with the kids and show them both sides of the coin.
I don't care who the chemistry teacher voted for as long as he keep his subject non-partisan.
Unfortunately, even science teachers who are flaming liberals can not resist imposing their liberal views on kids.
History and literature is a very important subject because that is where the critical thinking forms. There is a movement to revise history for public school textbooks. The selection of reading material also is very influenced by the liberal mindset of the selecTORS.