I'm adding something similar to blogsense very soon, called content hooking in the header and footer profiles. In BlogSense you can create header and footer profiles, and you can append these to individual campaigns you are running. Soon you will be able to hook a random(keyword discovered) youtube video to a header or footer. And then you could apply that footer to an articles campaign. But this is not available just yet is is probably three weeks out.
this is easy as 1,2,3 they are 100's of plugin that will help you do that go to http://wordpress.org/extend/plugins/
Just wanted to document that the hooks have been installed: http://www.blogsense-wp.com/news/blogsense-4-0-beta-released-to-community/