Sometimes, an American President has to deliver bad news to the nation. We feel that no matter how bad the news might be, it would sound better coming out of the moth of James Earl Jones. He has a calming and soothing way of speaking that would be ideal for the role of a global diplomat. When Jones speaks, you automatically listen, and you're inclined to believe him.
Imagine a debate during campaign season between Jones and any other candidate. Even if the other candidate had better political points, there's no way they'd be able to make them sound as good as whatever Jones had to say! He may be a little old now, but Jones has seen the world turn and is showing no sign of losing his edge with the passing of the years. He's one of the greatest actors in American history - and what are politicians if they're not actors?