A states'-rights challenge to enforcement of the Endangered Species Act...failed Monday when the justices, without comment, refused to hear it.The appeal had attracted widespread attention as the most potent of several efforts around the country to make the case that Congress's power to regulate interstate commerce did not extend to protecting animal or plant species that lack commercial value and that live in only one state....[T]he justices' action on Monday provided the latest evidence that the Rehnquist Court's federalism revolution is on the wane....[The case] concerned six endangered species of small insects that live only in caves and sinkholes in...