Sierra Club Independent Action's political endorsements and recommendations. To ensure the Sierra Club only endorses the best environmental candidates, our grassroots process begins at the chapter level. Volunteers examine each candidate's record and distribute questionnaires to candidates who meet our criteria. State volunteers then hold a first vote on endorsement. The Sierra Club National Political Team, made up of volunteers and staff from around the country, then holds a second vote to confirm the endorsement. Throughout our process, volunteers and staff evaluate the environmental and public health records of candidates and their experience of being a true champion on our issues.

Source: https://www.sierraclubindependentaction.org/endorsements