What’s wrong with Robert Kennedy Jr’s voice?

For him,  it’s a dystonic world.

When Robert Kennedy Jr. appeared on “Larry King Live” Monday, he hoped to gain attention for energy conservation. But as the public listened to his stilted, strained voice, he also drew attention to another cause

http://abcnews.go.com/Health/story?id=5296702&page=1

I looked this up after hearing him on my last post.