[Doradus]

Huh? That's funny--I would have said the opposite. It was from watching Obama's speeches that I learned that silent pauses can be much less annoying than "umms". If you want to see someone using a lot of "umms", watch Justin Trudeau.

[jordanb]

He speaks very differently during Q/A sessions than during speeches. During Q/A he's never not making a sound.