Sheldon has a series of speeches called The Scheme, which he records and posts on YouTube as video, and on his website as written versions. https://www.whitehouse.senate.gov/news/speeches/the-scheme-1-the-powell-memo/
The series goes into how the Republicans take over the Supreme Court shortly after the Civil Rights movements in the 1960s, around the time the parties switched. Sheldon goes into how dark money and Citizens United came into being, how it functions and influences court decisions and laws.
Then I found a website that tracks who in office takes dark money. To my great dissapointment, the man whistleblowning on dark money is listed there as taken dark money: https://www.trackaipac.com/congress
That website also follows new and upcoming candidates, but not all of them.