[O.C. - Old Cracker]

Notice that the projected picture of Kerry is not of him standing at the podium. The two don't match. It's a still photo. These guys are nuts.

[kittymyrib]

It looks like a clip from those old sci-fi conspiracy movies of the '70s. Who thought this was a good idea? Can you imagine the media screams if that were Pres. Bush in that pose with that background? That's all we'd be hearing from the frothing talking heads today.

[BigLittle]

Notice that the projected picture of Kerry is not of him standing at the podium. The two don't match. It's a still photo. These guys are nuts.
There's actually a delay between live, and what is projected.
It's in the processing equipment to get the picture from the camera onto the led wall.
Not to say these guys aren't nuts, however.