ABC News' united front fractures easily.

Poor ABC News. It can't even orchestrate a press conference without revealing how bad things are at home these days.

News division honchos - chairman Roone Arledge, prexy David Westin and anchor Peter Jennings - put on their smiles Dec. 17 and invited a room full of media reporters to hear about their 4-year-old, multimillion-dollar mega-project "The Century."

Problem was, the reporters didn't much care about the end-of-the-century broadcast/cable docu series, as it won't premiere until March 1999.

Topics like the Alphabet net's news staff exodus, the ratings decline for both "Good Morning America" and "World News Tonight," and division infighting make for …