That's not an ad. That's editorial content. That's difficult to get rid of without limiting access to other editorial content. Their choice to do it like this, your choice to view or not to view.
In its web site, the Washington Post has recently started posting its own ad banner --such as "See live results from Iowa" in this morning's news posting-- in the lower middle of a web page. The web site designers have apparently made it impossible to get rid of it so that it is quite annoying to read the news material while scrolling up.
The above is a new "phenomenon" in ad banners. Is there in fact some way to get rid of those apparently permanent ad banners?