Design your authority site to be in a way that you can fill many micro niches with this. Take i.e. a term like "hunting" and then you go for microniches like duck hunting, deer hunting, bear hunting etc. You can also align the terms with other issues. What is important is that you get good phrase combinations.
When i had my free movie blog, i optimized for one main, popular keyword phrase and then had MANY many supporting long tail keyword phrases and did very well in search engines. Starting up a new free movie/TV show blog is one of my big projects for this year. I know so much more about monetizing and selling ad space this time around, so it will be much more lucrative.