This anti-Hilary Clinton You Tube ad (i.e., “Hilary 1984”), which went up fairly recently, has been disavowed by spokespersons for Barack Obama‘s campaign, who are saying they had “nothing whatsover” to do with it. It’s a fairly stunning attack ad — stunning for its anger and the obvious fact that its creator sees Clinton as some kind of liberal Big Brother figure. It’s a sampling, of course, of the classic Apple 1984 ad that ran way back when. Fact is, it’s fairly brilliant.

A San Francisco Chronicle piece by Carla Marinucci that ran yesterday says Hilary 1984 “may be the most stunning and creative attack ad yet for a 2008 presidential candidate — one experts say could represent a watershed moment in 21st century media and political advertising.

The creator of Hilary 1984, which lasts 74 seconds, flatly declares his/her allegiance to Obama at the very end, and yet no one knows (or will confide) who cut the ad together. And yet the piece seems to be about more than just a preference for Obama over Clinton — it seems to be making a profound point about online vs. broadcast television as a source of general information, news and ads.

The spot represents “a new era, a new wave of politics…because it’s not about Obama,” says Peter Leyden, director of the New Politics Institute, a San Francisco-based think tank on politics and new media. “It’s about the end of the broadcast era.”

“But some say the ad is just the latest attempt by outside activists to influence political campaigns,” Marinucci writes, “or the newest way for campaigns to anonymously attack their opponents.”