A recent poll found that a clear majority of Americans favor limiting politics in the classroom. This is bad news for teachers’ unions, who often advocate against that very thing. Consider the American Federation of Teachers (AFT). With 1.8 million members, the AFT is one of the largest teachers’ unions in the country. It has gained prominence less for advancing classroom outcomes and more for engaging in political activism far removed from instruction. This political activism has been evident recently, as illustrated…