It used to be done with direct mail in the same sort of way. Campaigns would target mail drawing on data about homeowners that was either public record (certain

It used to be done with direct mail in the same sort of way. Campaigns would target mail drawing on data about homeowners that was either public record (certain taxes, party affiliation) or private and for sale (for example, lists of magazine subscribers). With good cross-referencing campaigns could mount efficient and effective direct mail campaigns. Karl Rove and David Axelrod, two men from different sides of the political spectrum, even teach a Masterclass together that continues to push it as a tactic (https://www.masterclass.com/classes/david-axelrod-and-karl-rove-teach-campaign-strategy-and-messaging/chapters/direct-mail# https://www.masterclass.com/classes/david-axelrod-and-karl-r...). Facebook is perhaps more targeted and a lot cheaper for the campaigns, but it’s nothing new to push targeted messaging under the radar where the media and other voters won’t see it.