Exam 11: Interest Groups and Social Movements

What type of interest group attempts to influence policies in ways that do not selectively or materially benefit its members?

Senator Bennett received a hefty donation from a pro-environmental lobbying group. He later voted in favor of a controversial pro-environmental bill. A pro-business group who opposed the bill claimed the senator's vote had been "bought." What factors make it difficult to determine the importance of the donation in the senator's decision to support the bill?