directive markdown issue

How do I use this directive markdown for a contentful field? I can see the contentful entry when rendered but the markdown doesnt work and renders the string as-is.
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I have all the same stuff referenced in my library: angular.min.js, angular-sanitize.js, angular-contentful.min.js, showdown.js and markdown.js. I also have the btford.markdown module dependencies initialized. Has anyone used this in a similar way? Thanks