U.S. Government Information: Campaign Finance & Lobbyists

"See how candidates and committees raise and spend money in federal elections."

"Promotes an accountable democracy by compiling comprehensive campaign-donor, lobbyist, and other information from government disclosure agencies nationwide and making it freely available."

Includes options to search political organization disclosures filed with the IRS.

Search lobbying firms and the clients (e.g. companies, non-profits, local governments) they represent at the state and national levels. Also has an "explore lobbyists by specialty" section that lets you identify a subject of interest from an alphabetical list and find lobbying firms for that subject area.

"The most comprehensive resource for federal campaign contributions, lobbying data and analysis available anywhere." Direct to Federal and State Lobbying page, an "unprecedented online resource providing cross-jurisdictional lobbying expenditure data."

"Use this database to find out who's lobbying on whose behalf — and on what issues."