Setting an Example
The President is chief citizen. This means the President should represent all of the people of the United States. Citizens expect the President to work for their interests and provide moral leadership. The President is expected to provide a good example for people in his/her daily life. As a chief citizen the president might participate in activities and events that do not benefit them politically but benefit the average citizens. The president may share their exercise habits, volunteer at a soup kitchen, or comfort people after a tragedy. In fulfilling this role the president is not acting out of power or self-interest but is participating as a citizen.
Check out this clip: http://www.c-span.org/video/?c4514719/chief-citizen-obama