Answer :
I don't know what options you had available but here are some ideas: 1) Journalists: since journalists present the information and compose articles that people write, they have an influence over people's political issues 2) celebrities - people very often trust celebrities because they can identify with them 3) authority figures - because people believe their judgements are well informed
It would be the Media because they are what brings the information to the people who justifies their opinion based off their source.