I get a lot of e-mail from parents and teachers who wonder if President Obama, whose children go to the private Sidwell Friends School, knows what is actually going on with all of the standardized testing in public schools. Here’s an open letter to Obama explaining what he is missing, written by Rebecca Steinitz, a literacy consultant in urban high schools, a writer and an editor. She was previously director of the High School Program at Lesley University’s School of Education and an English professor at Ohio Wesleyan University, where she ran the Freshman Writing Program. Steinitz is also a...