FactCheck.org has an interesting article up about the ad and the filibuster's not-so-illustrious history. Be sure to check out the sidebar letter from the president of People for the American Way for an equally interesting counterpoint.
That filibuster ad on tv
The ad that shows the clip from the black and white movie "Mr. Smith Goes to Washington." And then the guy comes out and says, "Hi. I'm a Republican, a common sense Republican."