Grassroots activism is infecting the well-to-do in Jackson Hole, Wyo., where rich and poor alike are rallying against a proposed federal nuclear waste incinerator in nearby Idaho. While many citizen movements lack the resources to mount successful campaigns against the government, organizers in Jackson Hole managed to raise a half-million dollars during one town rally last month. Harrison Ford, who owns a local ranch, kicked in $50,000, and a dozen Fortune 500 business executives followed suit, while many average Janes and Joes pitched in what they could afford.