Most people don't even know what influences them. The vast majority of people will claim no type of marketing works on them, they make up their own minds. Then after telling you that, they'll go out to their 4x4 SUV that's never been off a paved road or pulled a trailer.
Just read posts in P&N.
--"I don't watch Fox News or Breitbart! I ain't never heard of RT or OANN, neither!"
--proceeds to spout, verbatim, ridiculous fabricated talking points that were generated directly from RT or OANN, and endlessly discussed, exclusively, among those very same networks
--Simply too ignorant or cognizant to understand that trapping themselves in the same bubble of the same like-minded friends and associates means that your only sources really are those very same sources.