I'm assuming a copy of Kerry's speech and the evening's itinerary (balloon drops, etc.) was made available to media outlets with early deadlines. This allows the AP to feed the story to smaller daily newspapers that generally have early evening press runs. I don't think it's anything to get worked up over.
I think people are stunned, yet again, at the dishonesty of the leftwing 'mainstream'. They make out as if they were there to see it. They report as if it had already happened, as if they heard the words, and the crowd reaction, and saw the images, and so on.
If that's true, and they lied, don't you consider your own reaction equally stunning?