 The pundits pre-positioning for tonight's pivotal presidential debate. Here's CBS's Linda Kenyon. Body language expert Mark Bowden says it's all about the body language. The words don't matter that much. The sound that somebody makes matters more. And what we see them do matters most. For example. If they're more asymmetrical, then it's more difficult to understand what they're saying. Or we perceive it's more difficult. And we'll see them as less followable.