gistfile1.py

class PostForm(forms.ModelForm):
    body = forms.CharField(widget=WMDEditor)
    class Meta:
        model = Post

class PostAdmin(admin.ModelAdmin):
    list_display  = ('title', 'publish', 'status', 'visits')
    list_filter   = ('publish', 'categories', 'status')
    search_fields = ('title', 'body')
    prepopulated_fields = {'slug': ('title',)}
    form = PostForm

    fieldsets = (
            (None, {
                'fields': ('title', 'slug', 'author', 'markup',
                        'body', 'tease', 'status', 'allow_comments',
                        'publish', 'categories', 'tags', )
            }),
            ('Converted markup', {
                'classes': ('collapse',),
                'fields': ('body_markup',),
            }),

        )

    class Media:
        css = {
            "all": ("static/css/wmd.css",)
        }
        js = ("static/js/showdown.js",)