I teach in a public high school...and believe it or not, there are many Christian conservatives who teach...we're not ALL liberals. Even my liberal friends...most of them...keep their political philosophy out of the classroom AND they are all up in arms about this ruling. That being said, the union leadership is liberal and active...and unfortunately, most conservative teachers are more concerned about teaching than holding high office in the union.
I know several conservative, Christian teachers that stay. My concern isn't with them but with the liberal agenda that is being forced on them and our kids.
It doesn't take many.