[Icelander]

Current Affairs (Politics), Economics, Expert Skill (Memetics)*, Expert Skill (Political Science), Intelligence Analysis, Market Analysis, Politics and Propaganda are important, obviously. You'd need many people who had them, so the political influence and campaigns to work on public opinion is not merely coming from a single traceable source, but actually consists of mutually reinforcing memes of different kinds, coming from a wide variety of sources without any connections that can be found.

Many people with high skill levels of Accounting, Administration, Finance and Law would be needed, in order to skirt or circumvent campaign finance laws over a period of many, many years.

The actual political message and the propaganda would require, in addition to the core skills of Politics and Propaganda, a lot of people with high skill in Public Speaking and Writing, as well as social media influencers, who probably use some variety of Current Affairs and possibly other skills, like Artist or Photography, in order to craft their message. Of course, personal one-on-one influence would be done with Diplomacy and other Influence skills.

Mostly, though, keep in mind that you can't just have one person making all the skill rolls. That would mean massive skill penalties that essentially make this impossible for anything but mythological supernatural beings.

Those penalties would be for making it obvious what was going on, instead of being able to present things as natural changes in public opinion, not being orchestrated by anyone. It can't even appear as a grassroots movement, it has to involve a lot of different and apparently independent institutions and media outlets, which don't appear to be pushing the same message at all, but somehow all lead to a final state where politics, public opinion and prevailing legal theory all allow for the change you need.

*Or the campaign world equivalent.