Click here to watch "McCain: Fire Charlie Black."

A new ad (subscription) launched nationwide today by MoveOn.org pressures John McCain to fire his chief campaign adviser, lobbyist Charlie Black. The ad comes on the heels of five McCain staff resignations in the past few weeks.

An announcer claims Black's firm has "made millions lobbying for the world's worst tyrants," including the Philippines' Ferdinand Marcos and Zaire's Mobutu Sese Seko, and concludes by imploring viewers, "Call John McCain, and tell him to fire Charlie Black."

Ilyse Hogue, communications director for MoveOn.org, said the organization is planning on releasing another ad soon that delves further into McCain's lobbyist ties. "Black is the tip of the iceberg," Hogue said.

A Web-only version of this ad was released on May 16, and after noting its resonance with online viewers, Hogue said it was only logical to launch the ad on the airwaves to reach voters who may only get their news from TV. "We want to make sure the message of McCain's lobbyist problem was reaching people through all those avenues," she said.

Although Hogue said the target audience is voters in general, she wants to particularly reach out to independents, who she said will play a big part in this election and may not quite know the full story on McCain's claims of being a "Washington outsider."