LAST WEEK Al Gore was on the campaign trail again. Before a gathering of supporters in New York City, he slipped back into the role of self-styled defender of the common man and spotted owl, comparing the Bush administration to everything from Enron to a hungry fox in a chicken coop. Enthusiastic remarks from wife Tipper and daughter Karenna made a second Gore candidacy sound likely. This time, the former vice president warned, he’ll be “letting it rip, . . . pouring out [his] heart and vision for America’s future.”