 Many are still with him, but they worry that a lack of enthusiasm for his candidacy could cause many Democratic voters to stay home. Authorities in western states are warning of the rising risk of wildfires as hot conditions and low humidity dry out the landscape amid a protracted heat wave making much of the U.S. California's top fire official says so far this year the state has responded to more than 3,500 wildfires that have scorched nearly 325 square miles of vegetation.