...and they both come to the viewer courtesy of Bill Moyers (of the series Moyers & Company).
One, "America's Gilded Capital," about how D.C. is owned by big money, will outrage you and make you wonder how to hold public servants accountable to the public.
The other, "How People Power Generates Change," will answer the question (of what can be done).
You can watch both on the Moyers & Company website.
And while you are there, check out the rest of the site - a wealth of information.