Teachers’ unions rejoiced this week when Vice President and Democratic presidential nominee Kamala Harris announced Minnesota Gov. Tim Walz as her running mate, describing the left-wing ticket as a major win for public educators.But critics are warning that Harris’ selection of Walz, a former teachers’ union member who is opposed to what he has described as the school choice “agenda,” over Pennsylvania Gov. Josh Shapiro, a school-choice advocate, should raise alarm bells for parents and children in the public education system. The teachers’ union pushed hard to prolong school closures during the COVID-19 pandemic — many districts remained shuttered for over a year.“Anyone who makes Randi this excited is a 5‑alarm fire for parents and students,” former Educa …