In a talk he gave a week ago, Kevin talked about a “stop making sense” rule. His point: nobody else makes sense the way you do, so if you give a talk where you try to make sense for others, you’ll fail. Instead of making sense, you should be seeking sense. Instead of expressing how you see the world, ask the others for their sense of it. (This is easier said than done skillfully.)
Sounds like you can take this to the bank: how you LOOK is important, and your BODY LANGUAGE is also important. What you think and what you say? Not such a big deal.
Another point, reading between the lines of the MIT Study: you’re better off if how you look is congruent with people’s perception of your role – there are definite stereotypes. If you don’t look like a politician but you have political ambitions, it’s better to work behind the scenes. (I think politicians already know this).