The candidates tarred by these charges are:
* Lamm, who was widely seen as an ally of the civil rights movement during his term as governor, and who helped organize an NAACP chapter when he was at Berkeley. He is chairman of the Federation for American Immigration Reform (FAIR) board of advisers.
* Frank Morris, retired U.S. foreign service officer and former executive director of the Congressional Black Caucus Foundation
* David Pimentel, a Cornell professor of entomology who has been studying the impact of population growth on the earth's carrying capacity.
The background of the dispute is that the Sierra Club does not want to make the obvious move for an environmental organization in an era of mass migration -- calling for limits on immigration to relieve pressures on the ecosystem. Thirty years ago the Sierra Club committed itself to "stabilization of the population, first of the United States and then of the world." In those days, stabilization in the U.S. meant urging native-born Americans to have fewer children. By 1996, when stabilization meant doing something about mass migration, legal and illegal, the Sierra Club backed away from stabilization and adopted a policy of neutrality on immigration.