I don't understand why the media lets them get away with it. Politicians do this constantly. In the last US VP debates Palin didn't even bother answering somet

I don't understand why the media lets them get away with it. Politicians do this constantly. In the last US VP debates Palin didn't even bother answering something related. She'd say: I'm happy you asked me that but I just want to mention [cue pre-prepared talking point that doesn't have anything to do with the question]. Why do interviewers allow them to get away with such obvious tricks? One of the reasons Andrew Warner is such a good interviewer is because he doesn't put up with that kind of weasely response, he'll just repeat his question until it gets answered or he gets a response that directly addresses the fact that the interviewee doesn't want to answer it.