CNN is running a house commercial that on its face is a plea for respect for demonstrable facts. "This is an apple," a voice says over an image of a bright red apple. "Some people might try to tell you that it's a banana. They might scream, "Banana, banana, banana," over and over and over again. They might put "BANANA" in all caps. You might even start to believe that this is a banana. But it's not. This ... is an apple." The commercial closes with the text "Facts First" and the CNN logo. CNN has aired several variations of this commercial, all with the theme that someone is trying to...