Ventriloquism?

The note to this clip states:

His every intonation is in imitation of a voice, captured by camera audio equipment, shepherding him.

There probably is a simple explanation: either there is some sort of delay in the broadcast and the superimposed voice is W himself, or it is the voice of the interpreter. English speaking people to need help in understanding W.

Come on. You don't think he needs someone to read the speech for him. That would be crazy....wouldn't it?