Have you ever actually tried to smile really, really big while speaking? It's a tactic used by scummy politicians like Pelosi and Hillary Clinton. They use the technique to distract from bad news that they are spewing. The technique actually does work somewhat on gullible people.
Have YOU ever tried to speak like that? It's very bizarre. Try it. Keep in mind how bizarre that is the next time to you see a 'smiling' politician that is talking.