databases of independent expenditures
CRP Outside Spending See the Center for Responsive Politics’ data on how much politically active nonprofits have spent on federal elections and how that data breaks down across partisan lines.
nimsp Search the National Institute on Money in State Politics' records of independent spending.
information about politically active nonprofits
guidestar Search the tax filings of politically active nonprofits to learn about their mission, board members, income, and political expenditures.
crp dark money groups The Center for Responsive Politics provides detailed information on politically active nonprofits, including what groups have spent in previous election cycles.
the ads that dark money buys
political ad archive The Internet Archive has information on ads that have aired in key primary states.
fcc The Federal Communications Commission has a searchable database of the public filings of radio and television stations, television networks, cable providers, and satellite systems that includes documents containing information on political ads.
super pac profiles
state disclosure laws
campaign finance terminology