Ava DuVernay's Selma was one of the most critically acclaimed movies of 2014, racking up a 99% "Fresh" rating on Rotten Tomatoes. However, when it came time for Oscar nominations, it was only nominated for Best Original Song (which it won) and Best Picture, but surprisingly without any nominations for Best Director, Best Original Screenplay, or Best Actor for David Oyelowo's performance as Dr. Martin Luther King Jr. So what happened? Why was Selma largely overshadowed in favor of middling dramas like The Imitation Game (8 nominations), The Theory of Everything (5 nominations), or American Sniper (6 nominations)? …