I hear that John Kerry loyalists are kicking themselves for cooperating last year with filmmaker Steve Rosenbaum on "Inside the Bubble," a potentially devastating behind-the-scenes look at the Massachusetts senator's failed presidential campaign. I'm also told that Hillary Clinton partisans are licking their chops to see the film, which "could end up being the silver bullet that kills Kerry's presidential chances for 2008," says a Lowdown spy. Kerry spinmeister David Wade - one of the senior staffers who allowed Rosenbaum to film his private moments - tried to dismiss Rosenbaum's effort as "a childish home movie destined to be forgotten."...