I think the main vehicle is closeness to journalists, who get certain benefits regarding their profession and who are groomed to report in a certain way. You c

I think the main vehicle is closeness to journalists, who get certain benefits regarding their profession and who are groomed to report in a certain way. You could really see it working before the Iraq war in the US. It was unpopular until media really hammered it in with weapons of mass destruction and the allegedly imminent danger. Not exclusive to the US, but western countries tend to keep key figures in the media very close aside from the more naive reporters.