This was fine 10 years ago because I would, if I wanted to get an impersonator of someone's voice who carries a lot of weight, I'd have to go through to the work of hunting them down, finding out if they were willing, paying them, or I guess having tons of children and waiting decades and hoping their voice is right for what I need.
Now I can sit at a computer and spend a few hours doing it.
You are completely blowing past the facts of what a person's voice is, and the value it has if that person is someone special to a lot of people. Are there people out there who can do spot on Obama impersonations? Of course. Is the former President not wanting someone who sounds like him to pretend to be him to endorse a local candidate trying to unfairly "fence off" too much of the "voice space"? Give me a break.