The bidding for Tribune Co.'s Newsday has attracted some of the biggest names in the New York media world. News Corp.'s Rupert Murdoch led the charge with a $580 million offer. New York Daily News owner Mort Zuckerman quickly matched it. Now Cablevision's Dolan family has lobbed in a high bid of $650 million. Cablevision's involvement is the most puzzling of the three. After all, the Dolans are cable guys, not newspaper publishers. Nevertheless, there's a strange logic to it.