From the universe of Avatar the last Airbender Avatar, Aang was the Avatar to end the 100 year war going on between the four elements. Raised a monk of the southern air temple Aang was taught from a young age that everyone should be treated fairly and voilence was never the answer. He was able to singlehandedly subdue the evil fire nation King, who was responsible for killing thousands, without violence. Having to learn all four elements by the time he was 13 Aang was put through many trials and tribulations in his youth and was able to triumph over them all. If you would like to read more about this lovely individual feel free to visit Aang's Wiki at the link here!
I think a good ruler considers all lives they have reign over, not just those most similar to themselves. I believe a good ruler listens to their people and is able to adapt with the times, because whoever was ruling 50 years ago will have different problems and different goals than whoever is ruling now. These are all traits I feel that Aang posesses and excels in showing off, he's a kind and just leader that I believe any person would be lucky to live under his reign.
As the Avatar Aang had to travel all over the world and win over the hearts of many in order to gain allies in his cause, I believe his political campaign would be very similar. He would travel the world in order to rally votes, maybe host some fundraising events for the less fortunate, he was very giving and liked taking care of everyone he met. And this would also show what an active leader he would be, immediately flying out to any place in distress to offer instant relief, I believe this would bode well for him in the elections and he wouldl easily win the hearts of many.