Radio listeners have discovered the Swainson's hawk is doomed and it's all Phil Angelides' fault. TV viewers, however, have learned that Steve Westly favors "taxing the middle class (and) letting big corporations off the hook.'' With little more than a week before the June 6 primary election, the two Democratic candidates for governor are going all negative all the time, hoping to convince uninterested voters not that they're so good, but that their opponent is so bad. The nonstop mud-slinging even has supporters concerned. Larry Fahn, immediate past national president of the Sierra Club, was speaking Friday with reporters defending...