https://www.siliconvalley.com/2019/11/21/google-launches-new-crackdown-on-political-ad-targeting/

With the 2020 presidential election now less than a year away, Google is placing broad new restrictions on how political ads are targeted on its sites, including no longer allowing advertisers to target their ads based on a voter’s political ties.

Google announced the changes late Wednesday, saying that the moves would “align our approach to election ads with long-established practices in media such as TV, radio, and print, and result in election ads being more widely seen and available for public discussion.”