I received some public speaking training from the agency I was working with during the Clinton campaign years ago, and we watched tapes of his campaign speeches and debates. I was struck by how certain the instructor was that Clinton was a well trained liar. Seriously, we analyzed delivery, eyes, facial features, etc. When they look straight into the camera, they're lying. You take someone with a whole lot of natural talent, then give them a world class coach, and you win a Presidency.