This is a guest post by Tom Gilbert, my son, a college sophomore majoring in philosophy and film. “To write a mighty book you must choose a mighty theme.” –Herman Melville, Moby-Dick “Everyone knows I’m not a folk singer,” says Jude Quinn/Cate Blanchett/Bob Dylan at the end of I’m Not There, and I might have taken that a little easier if it was said to a superimposed LBJ or questioning reporter. But as it stood, right into the camera, with …