Paul Krugman posted this commentary about the Common Core standards. Clearly he has never read them and has no idea about the legitimate concerns that teachers and principals have. Instead, he echoes the claim by Times’ writer Bill Keller that the opponents are nearly all rightwing extremists. I just left a short comment, which has not been moderated and approved yet. I expressed my concern about the lack of field testing and the now evident increases in achievement gaps. Raising the bar does not help kids clear it; it just increases the numbers who can’t clear it. You should add yours.