Unable to successfully subclass MarkdownModelAdmin

I'm following [this tutorial](http://arunrocks.com/recreating-the-building-a-blog-in-django-screencast/) and I've followed the guide exactly. Still I'm unable to get the MarkdownModelAdmin functionality working (MarkdownField for text entry and a preview of the formatted markdown in the admin panel).

There are others who have had the same problem and reported this in the youtube comments. One person suggests changing the TextField to a MarkdownField in the model, but this doesn't really seem like an optimal solution, since the preview functionality doesn't work.

Is this a bug or a feature and if it's a feature, how do I get this working?
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The issue names no source file or test; first reproduce the tutorial setup and compare the TextField, MarkdownField, and MarkdownModelAdmin configuration described there. Trace how the admin form and preview are wired, then verify that Markdown entry and formatted preview both work in the admin panel.

Written by the indexing model from the issue text.