I am afraid that I am so "wanting" to think badly of CNN that I may not be able to be convinced of any accidental X.
Maybe an accidental showing of a message meant for "in house" viewing...that I can imagine and accept.
They are not just anti-Bush/Cheney. They are anti-American.
This is NO accident. It may have been a childish, malicious game, but it was done deliberately.
You can take that to the bank.