While I agree with what you said above, I think your missing the point entirely. Obama is unelectable - particularly if more Black racism charges surface, about his wife or his associates.
But the point is - he hasn't won the nomination yet. If Republicans control this tape, now is not the time to reveal it!! Wait until he has a lock on the nomination...wait until October....
If Mrs. Clinton controls it, then it will be announced before Obama can claim the nomination. Then Clinton becomes McCain's opponent.....and I am not convinced, nor or many other observers, that McCain can win against her.