I believe Reagan had that honor! 
Disagree completely.
Watch the Reagan/Mondale debates, listen to any "off the cuff" remarks at a press conference etc. Reagan was gifted in the area of speech, posture etc, as he should be...he was an actor before he got into politics.
Compare that to Obama, it isn't even close. To many stutterings, to many "uh, uh, uh, uh" to much thought needs to go into what he is going to say etc. I'm not saying that with a telemprompter Obama is bad, he can speak well but when it comes to the skill of actually "speaking", Reagan and even Clinton has him beat.