Keith Olbermann's mother passed away the other day. On tonight's Countdown, he did one of the loveliest tributes I've ever seen, avoiding all the clichés and mawkishness that you so often get with these things. I know there are some folks who read this site who hate Mr. Olbermann and there are times when I even think he goes too far in some area where I essentially agree with him. But I can't think of another broadcaster working today who could do something quite this classy…