Chesa Boudin is the son of radicals, his parents were part of the infamous terrorist group the Weather Underground. He is a radical in his own right though, one of the key promises in his campaign was to stop prosecuting quality of life crimes. These are crimes that range from broken windows to public urination.
Chesa Boudin received money from allies of Soros, the ACLU, an organization that takes millions from Soros, backed his campaign, and Chole Cockburn. Cockburn is a known associate of Soros and is seen in many of the same races as Soros.