In addition to making all ads, along with their targeting criteria, bought by any one actor, we'd need something more still. The second level. For all politica

In addition to making all ads, along with their targeting criteria, bought by any one actor, we'd need something more still. The second level. For all political ads, why not aggregate and publish the demographic's preferences too? "People who liked this ad also liked $these_things." That way you could see what kinds or subgroups the ads are trying to engage.