There is a video/audio sample of Podesta's known voice side by side with the 'Kid in the Cage' video using voice analysis software that was put out the same week as the video in question hit the net.

They are identical in almost every way. While it isn't conclusive proof, its damning especially considering the analyst who did the video is a trained professional.

Its since been scrubbed from Youtube. Not sure if its on anywhere else.