Correction: at least he had slightly more of a soul than Bush.
Our system does not take into account the laziness and stupidity of people (voters and politicians), which is why it was doomed to fail and is why it already has failed. None of our presidents want to make America or the world better, they just want to hold office for four years, retire, and let the next guy deal with it. Unfortunately, the next guy always has the same attitude and nothing ever gets accomplished.
We need to create a system that makes our leaders want to push ahead for the future. If humanity is to survive, we have to create a world government eventually, but none of our leaders are interested in that or ever will be if we keep up this system. And I'm not just referring to the US's system.