RFK Jr. Speech impediment?

Does Robert F. Kennedy Jr. have a speech impediment?
I watched him last night on Olbermanns show, and he seems to huff when he talks. The great Katherine Hepburn did this also. Does he have a medical problem?

nevermind

Yes, he has a medical problem. I once started a thread on the same subject, but don’t remember the name of his condition.

Here it is. Spasmodic dysphonia, according to the thread.