Interest Groups
The landscape of organized interests — from corporate lobbies to public interest groups — and how they shape policy.
The Interest Group Ecosystem
Interest groups come in many forms. Corporate lobbies (individual companies and trade associations like PhRMA or the US Chamber of Commerce) spend the most. Labor unions, once the primary counterweight to corporate power, have declined in membership but remain influential. Professional associations (AMA, ABA) advocate for their members. Single-issue groups (NRA, AARP, Sierra Club) mobilize passionate constituencies around specific causes.
Public interest groups (like the ACLU or Common Cause) claim to represent broad societal interests rather than narrow ones. Think tanks (Brookings, Heritage Foundation, Cato Institute) influence policy through research and analysis, though their funding sources often shape their conclusions. The landscape is heavily tilted: business interests outspend all other categories combined, roughly 12:1 in lobbying expenditures.