I remember Rush Limbaugh mentioning him several years ago. He may have called the show. He is a Rush fan.
From http://www.rushlimbaugh.com/daily/2012/02/24/greenberg_warns_the_big_lie_isn_t_working:
The next night, [Moochelle] has a big blues bash with The Wrinkled One, Mick Jagger. He needs to iron his face, like Ann what's-her-face. Ma Richards. I always thought, "Just iron your face." Mick Jagger, the same thing. The Obamas had B.B. King at dinner. Did you know this? I love B.B. King. One of my all-time favorite tunes, my all-time top-ten favorite, he sang it. B.B. King is in a wheelchair. He's diabetic. He's 80-some-odd years old, Snerdley, and he can still belt it out! And you know he sang The Thrill is Gone to Obama and Moochelle! He actually sang it. That was part of his repertoire: The Thrill is Gone. I know we got it in our Prophet System. You don’t have to find it right now, Mike, but get it up. We'll have it ready here and the song up in mere moments.
...BREAK TRANSCRIPT
RUSH: (music) There you go, folks. B.B. King. Think it's 1970, 1971. The title of the tune is The Thrill is Gone, and he performed it live in front of Obama and Moochelle this week. (song continues) Can you imagine Obama sitting there listening to this and probably not getting it? Ha-ha-ha-ha.
He may have called the show. He is a Rush fan.
You may be thinking of Clarence Henry.