From California KPFK (Pacifica Radio) has a strong base with five stations.

(Part NPR...part BBC...they are fiercely independents but... lots of their material is canned promo "interviews."

Make it easy, free and liberal and you might get air-time.

https://www.kpfk.org/volunteer/

Sincerely,
Gargoyle

Scandals, fraud, bankruptcy, have reduced their foothold on the liberal agenda.