The preview for this page:
https://en.wikipedia.org/wiki/Next_New_Zealand_general_election (can be previewed from "Next" on this page for example: https://en.wikipedia.org/wiki/New_Zealand_general_election,_2017)
shows an image of a leader of one specific political party. It is problematic for the preview to show one leader over another in an electoral race that has not begun and and is not decided. Presumably there are similar instances of electoral decisions or democratic debates where the image should be carefully moderated to avoid associating the Wiki article with one or other side or prejudicing the impression of the page before it is opened.