San Francisco Chronicle: Who is the person behind the Clinton attack ad?

From the San Francisco Chronicle:

"First it was talk radio, and then it was cable news – and now it's the blogs that are setting the agenda for the mainstream media," says [Tobe Berkowitz, interim professor of communications at Boston University – and a former advertising industry veteran]. "You can take something that you could never break into the news cycle with, and all of a sudden it's kaboom."