It seems that CBS was delaying the investigation into Rathergate in order to avoid having to discipline its employees. From Broadcasting & Cable:
Pre-election, the feeling in some quarters at CBS was that if Kerry triumphed, fallout from the investigation would be relatively minimal. The controversial piece’s producer, Mary Mapes, would likely be suspended or fired, but a long list of others up the chain of command–from 60 Minutes II executive producer Josh Howard, to Rather and all the way up to news division President Andrew Heyward–would escape more or less unscathed.
Here’s hoping they get what they deserve.