https://www.opensecrets.org/dark-money/
https://www.economist.com/graphic-detail/2019/08/29/socially-liberal-companies-really-do-contribute-more-to-democrats?cid1=cust/dailypicks1/n/bl/n/20190829n/owned/n/n/dailypicks1/n/n/LA/300161/n
https://www.fec.gov/
https://justcapital.com/
