I think self-selection is a huge part of the current problem. People who are drawn to political power, are likely also drawn to military power. I think this contributes to the never-ending war-mongering the U.S. does.

Lobbyists, special interest groups, etc. would have no power, since they can't help you win an election. People are most easily manipulated for casual decisions with low value. If they had the responsibility, I think most people would rise to the challenge. If they can't, we need to end juries immediately.