It is now official. The Daily News is no longer able to hide its partisanship behind any legitimate definition of what constitutes news judgment. In its coverage of the mayor's absence at yesterday's debate, the paper put the story on page 39. It even had the gall to put a mayoral photo-op, with Rosie O'Donnell of all people, on page 22. The Post had a lively debate report on pg. 2, along with a series of question for the man who didn't come to dinner. The Times lead with a picture on its front page with a follow-up feature on pg. B1 of the Metro Section. The Sun and Newsday also prominently covered the mayoral duck. Who's making these decisions?