Today on the presidential campaign trail (AP)

AP - Obama assails McCain for 'naive, irresponsible' foreign policy, lays down challenge ... McCain courts NRA, 2nd Amendment devotees, makes a West Virginia gun shop visit ... Clinton launches ads in upcoming primary states, focuses on working-class issues in Oregon ... Democratic Party panel members show little interest in Clinton's call to seat disputed delegates ... Obama picks up endorsements from former Edwards delegate, California congressman.