Today marks the 25th anniversary of "A Nation at Risk," the influential Reagan-era report by a blue-ribbon panel that alerted Americans to the weak performance of our education system. The report warned of a "rising tide of mediocrity that threatens our very future as a nation and a people." That dire forecast set off a quarter century of education reform that's yielded worthy changes – yet still not the achievement gains we need to turn back the tide of mediocrity. ...We're also far more open to charter schools, vouchers, virtual schools, home schooling. And we no longer suppose kids must...