If you have a system which allows every person to vote for the candidate who is most representative of their values, it stands to reason that the person who is elected will (at least appear to) be an average Joe, appearing to conform to the middle of the bell curve in terms of policy opinions, personal taste, intelligence, and charm. These results are skewed when it comes to things like height and professionalism, which many voters favor in their leaders.

Consequently, many leaders are chameleons (figuratively, not literally), able to change their appearance and political opinions to appeal to the majority, and not offend vocal minorities, such as religious people who believe that weather is directly caused by the decisions of a personal deity.

Yeah, I made it work. ;)