"ABC HELD IT FOR KERRY/EDWARDS!"
Let me speculate wildly here for a moment. ABC receives a tape from someone in Wierdistan. They immediately contact governmental authorities (I believe they would do this). The authorities tell them not to show it until they can work with it and ABC does so, not over political concerns, but because they are sensibly asked to do so.
and then the CIA thugs who desperately wish a Kerry victory sit on it for a week or two.