Here's a useful exercise: when watching a politician speak on TV, turn down the volume. Notice the gestures. Note their similarity to the gestures politicians everywhere in the world use - exhortation, indignation, and so on. Then turn up the volume. Listen to what the politician is saying. Here's a virtual guarantee: he (or, more rarely, she) is saying things that appeal to the group of voters most likely to get him into power or keep him there.
Robert Wright
The Moral Animal, pp258-259