Why so coy? How about the rest of us? Who's the sponsor? YouTube? The RNC?
In order to get rid of it I had to disable the link banner in preferences: Manage Blocks. I initially tried to just disable all the forums in the scroll bar, but that didn’t work. I went back in and disabled the rest: Banner links and locater? Whatever. All I know is that when I disabled everything I got rid of the ad. I never used the scroll bar anyway or any of the other links.