Mayor Mare has been the Mayor for quite a while. She has led Ponyville with Leadership, Grace, and Wisdom for her whole multiple terms.
The reason she wins the race though, is heavily based on the debates.
The other candidates are often silenced by her vast wisdom.
The more aggressive candidates are thoroughly chastised (p'wned) by the Mayor.
But this race is different.
For Mayor Mare races against somepony different.
A country lawyer named Abraham.

(Got this idea from the cover pic. Hope this gets featured!)