Back in my day, I have no recollection of teachers having such strong reaction to an election.
To the contrary, I recall having discussions about the elections, with the teachers being more of a moderator, and not expressing opinions of their own,.
I recall one class, in which the class period was devoted to a debate. The teacher had Nixon people get in one corner, Humphrey supporters in another, and Wallace people in another. This was in 1968.
We were all encouraged to speak freely as I recall. There was no “politically correct” opinion imposed from above.
I would be surprised if nowadays, a public school felt free to devote class periods to the campaign, and discuss the relative merits of Trump and Hillary.
My 5th Grade Teacher didn’t like the Beatles and she told us so.
It was either that evil Rock and Roll they played or their Haircuts.