By choosing Betsy DeVos as his nominee for the Department of Education, Donald Trump has proven his seriousness about increasing school choice and ending the Beltway’s micromanagement of local education. But whether the subject is charter schools, vouchers, distance learning, or education savings accounts, the teachers’ unions have cried foul. Their interest isn’t students, parents, or even individual teachers, but rather preserving their cut of the $670 billion K-12 market.