The Wisconsin Online Resource Center has nearly 2,000 of what they call “learning objects” on their site, and quite a few are accessible to English Language Learners.
I have posted links to several in various areas of my site, including Amendments to the Constitution and How A Bill Becomes Law in the Citizenship category of my English Themes for Beginners and Early Intermediate page. Those don’t have audio, but the Hmong/English Introduction learning object in the Hmong section of the Bilingual Exercises page has both audio and text.
These learning objects are basically short flash presentations with interactive exercises.
You can link directly to each individual learning object, but you have to register if you want to browse through them all. Registration is free, and takes about thirty seconds to do.