Actually, it's something called the "National Election Pool" - made up of a consortium of ABC, AP, CBS, CNN, Fox, and NBC. I believe, however, it is being spearheaded by AP this year on a rotating basis.
It's basically the new corrupt exit polling propagandist, replaceing the old corrupt exit polling propagandist, the Voter News Service (VNS).
Thanks! In other words, SSDD. I won't pay it any mind :)