Brennan Center
https://www.brennancenter.org/issues/money-politics
Alexandria Ocasio-Cortez
Republicans
https://www.theatlantic.com/politics/archive/2015/04/not-all-republicans/390912/
John McCain
https://www.brennancenter.org/blog/how-john-mccain-nearly-made-gop-party-campaign-finance-reform
Popular opinion