On the heels of Cynthia Ervio’s Academy Award nomination let’s take a look at the Harriet Tubman biopic, “Harriet.” While “Harriet” is fine as a film, and Ervio’s performance is relatively strong, the strength of the film comes mostly from the source material. Cynthia Ervio, Leslie Odom Jr., Janelle Monae, and Joe Alwyn star.