The Volokh Conspiracy has a few observations
about why MoveOn is demanding that a CBS story that hasn't even run yet be put on the air:
Wizbang explains how MoveOn knew about what CBS had said in a story that hadn't run yet. It appears that CBS gave a tape of their half-hour story (before its scheduled broadcast) to organizations that share CBS's orientation, such as Salon. Salon has a long, credulous description of CBS's story, with direct quotes (nonmembers are subjected to a long ad to get a free day pass to Salon Premium).
Talk about collusion. CBS sinks further and further into the muck.