“Federal rules on disclosing party and campaign funding were adopted on 18 June 2021 as an indirect counter-proposal to a 2017 transparency initiative and took effect on 23 October 2022. GRECO, which had urged such rules since 2011, called the law a major step but noted expenditure transparency and independent auditing were not covered.”

Context. These sources document the rules and the Council of Europe's assessment, not the size of money's effect on outcomes.