Enterprise Holdings has dropped its membership in the American Legislative Exchange Council, a conservative lobbying group, after getting pressure from consumers.
One online petition, urging Enterprise to quit ALEC because of the group's position on climate-change legislation, has more than 89,000 signatures.
Laura Bryant, an Enterprise spokeswoman, said in an email that "we carefully listened to customers and business partners who expressed sincere concern about our ALEC membership, and after much consideration, we decided to resign our membership."
Enterprise, based in Clayton, is the world's largest car-rental company. Bryant said the company joined ALEC to fight against state and local taxes on rental cars, "and had little if any engagement with the organization beyond that."