WMD in Django Admin?

I know how to use WMD and other such javascript editors in regular django forms using widget=. However, how do I use WMD for text fields in the Django admin? On top of that, how do I use it for the content field on contrib.flatpages in the admin?

Also, I think I might like to use the StackOverflow fork of WMD, so I would like any special instructions for that, if necessary.

I know how to use the markdown filter in the templates, so that part is ok. I just need to get the editor to show up and work in the admin interface.