Body language can sometimes convey meanings that verbal languages cannot do. Body language also provides critical insight to what the speaker actually feels and what kind of tone and attitude the speaker is setting in a discussion. In lights of recent presidential debate, here is a short clip by BBC that quickly analyzes the body language used by the two candidates.
To watch the video, follow this link:
Here is another article by Jonathan Mahler of NYT that goes through the dynamics of the debate looking at the body languages of the two candidates. Here, the author muted the debate and still was able to find out who won!