“Chappaquaddick” (*** out of four) was a stirring biographical drama about the 1969 incident on the Chappaquaddick in which the ambitious U.S. senator Ted Kennedy (Jason Clarke) left the scene of an accident involving his campaigne strategist Mary Jo Kopechne (Kate Mara) and how this incident and its subsequent media firestorm altered the course of history for his (and his family’s) plans for his run for presidency. Not a great film but an interesting story of political machinations, media coverage and coverups, and one man’s difficulty in following his family’s legacy. Clarke gives what may be the best performance of his career as a man who finds his conscience drowning along with the incident. Ed Helms is also strong in an unusual part as Kennedy’s cousin Joseph Gargan and Bruce Dern is first-rate in a small-role as Kennedy’s father Joseph, Sr.