Keep in mind its not a “catch” until both feet come down in the end zone.
See Ravens/New England AFC championship game http://www.youtube.com/watch?v=UmRDhHBZ3Fs&feature=related where Lee Evans had ball in hands and one foot down but defender knocked ball out of hands.
The defender in this case did not have both feet down before the receiver gained partial control of the ball as they both landed on the ground. Only when they landed on the ground is a catch official and at THAT point there was a “simultaneous” catch and those go to the passing team.
It sucks, I’m not a fan of either team, but I believe the call was correct. Touchdown.
What you failed to see was that Tate took the ball from Jennings after they were on the ground. The one ref was calling a INT/TB when the other bozo re came in from a few yards away to call it a TD.