You CAN Try This At Home!
All you need is an internet connection and a whole lot of patience to pour over the data that are available about campaign finance in Arizona. Here are some sources that were used to compile information for this website:
Arizona Secretary of State Election Campaign Finance Database https://apps.azsos.gov/apps/election/cfs/search/CandidateSearch.aspx
Arizona Corporation Commission Corporation Search https://ecorp.azcc.gov/EntitySearch/Index
Federal Elections Commission https://www.fec.gov/data/
Open Secrets https://www.opensecrets.org/
Goggle the “Paid for By…” organizations. Check out their Annual Reports!
Wikipedia has information on many national level organizations.