<Tr> <Td> Federal </Td> <Td> Center for Responsive Politics </Td> <Td> <P> Center for Responsive Politics; MapLight </P> </Td> <Td> MapLight </Td> </Tr> <P> Center for Responsive Politics; MapLight </P> <Tr> <Td> State </Td> <Td> <P> The National Institute on Money in State Politics (followthemoney.org) maintains a publicly accessible database for campaign finance information for state - level races in all 50 states dating back to 1989 . </P> <P> MapLight has state - level data for Wisconsin and California . </P> <P> In Pennsylvania the Department of State maintains a database searchable by the public . In California the Secretary of State maintains public databases on campaign finance and lobbying activities . </P> </Td> <Td> </Td> <Td> MapLight for Wisconsin and California </Td> </Tr> <P> The National Institute on Money in State Politics (followthemoney.org) maintains a publicly accessible database for campaign finance information for state - level races in all 50 states dating back to 1989 . </P>

What are the rules about interest groups spending money on issue advocacy during a campaign