evidence: This is an update to our 2019 report. [...] Source: Public Citizen’s analysis of data provided by the Center for Responsive Politics (www.opensecrets.org) [...] [12] Karl Evers-Hillstrom, Most Expensive Ever: 2020 Election Cost $14.4 Billion, OpenSecrets (February 11, 2021), https://www.opensecrets.org/news/2021/02/2020-cycle-cost-14p4-billion-doubling-16.