Ralph Nader’s presidential campaign under the Green Party banner, which is attracting a growing number of environmentalists and labor union members, could cause headaches for Al Gore and give a boost to George W. Bush. Friends of the Earth has suggested that it might endorse Nader, and the United Auto Workers union has praised Nader in recent days while criticizing Gore for his support of normal trade relations with China. Most national polls show Nader drawing 4 to 5 percent support, while in California that jumps to 9 to 10 percent. Nader could tip the balance against Gore in a number of key electoral states, including California, Michigan, and Ohio. Nader’s stated goal as a candidate is to get 5 percent of the vote in order to qualify for federal matching funds in the next election.