Ted Kennedy's life and political career become derailed in the aftermath of a fatal car accident in 1969 that claims the life of a young campaign strategist, Mary Jo Kopechne.
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Jason Clarke as Ted Kennedy
Kate Mara as Mary Jo Kopechne
Ed Helms as Joseph Gargan
Bruce Dern as Joseph Kennedy
Jim Gaffigan as Paul Markham
Olivia Thirlby as Rachel Schiff
Clancy Brown as Robert McNamara
Taylor Nichols as Ted Sorensen
John Fiore as Chief Arena
Gillian Mariner Gordon as Cricket
Katie Henoch as Suzy
Lexie Roth as Nance Lyons
Angela Hope Smith as Maryellen Lyons
Vincent Tycer as David Burke
Victor Warren as Stephen Smith
David De Beck as Sargent Shriver
Barry Press as Burke Marshall
Matthew Lawler as Dun Gifford
Beth Petrou as Ann Gargan
Thomas Kee as Walter Steele
Andria Blackman as Joan Kennedy
Donald Watson as Dr. Watt
Walter Driscoll as Dr. Mills
Joe Chase as John Farrar
Joseph Zamparelli as Officer Look
Charlotte Dore as Gwen Kopechne
Tim Jackson as Joseph Kopechne
Damien Di Paola as Ray LaRosa
Ed Peed as Eugene Frieh
Bill Humphreys as James Reston
Gary Tanguay as TV Interviewer
Diana Boudreau as Police Secretary
Alison Wachtler as Liz Trotta
Tony Viveiros as Floor Producer
Sean Patrick Hopkins as Ross Richards
Tamara Hickey as Marilyn Richards
Nancy O'Brien as Neighbor
Tom O'Brien as Neighbor's Husband
Noah Carpenter as Teddy Jr.
Sarah Elizabeth Mitchell as Senate Secretary
A.J. Accardi as Hotel Clerk
Theresa Curran as Cantor
Michele Proude as Vicki
Michael Fennimore as Chief of Staff
George Capaccio as Doctor
Dustin Tucker as Senatorial Aide
Jack Harte as Reporter #1
Bob Jaffe as Reporter #2
Brian Currie as Reporter #3
Paul Pape as Dick Drayne (voice)
Jake Head as James Smith (voice)
Chris Edgerly as Edmund Dinis (voice)
Wally Wingert as Newscaster (voice)
Piotr Michael as Newscaster (voice)
Bill Mootos as Older Reporter
Jody Ebling as Ethel Kennedy
Philip Dorn Hebert as Jack Crimmins
Holt Murray as Mr. Samuels
Sawyer Murray as Donnie
Rick Malone as Steele Cronie
Rick Hamilton as Ferry Captain
Caleb Enos as Deckhand
Paul Taft as Vineyard Gazette Photographer
David Callanan as Charles Tretter
Thomas Whitestone as Organist
Patrick Sheehan as Lawyer
Jeff Savage as John Culver
Tom Briody as Lawyer
David Lucas as Lawyer
Ed O'Keefe as Funeral Priest
Thomas Brogan as Edgartown Policeman
Robert Burke as Admin Worker
Charles Mathison as Admin Worker
Luke Nelson as Admin Worker
Robert Tremouille as Admin Worker
Skye Gladstone as Dike House Inhabitant
Timothy Canady as Security Agent
Patrick Parhiala as Security Agent
Whitney Cass as Security Agent
Robert Conley as Security Agent
Michael Swanson as Security Agent
Ralph Bennett as Fire Truck Driver
Nathan Bruckler as Tow Truck Driver
Camille Faman as Female Employee
Carrie Ann Quinn as RMV Attendant
Susan Garfield as Senate Staffer (uncredited)
Marinko Radakovic as Reporter
Paul Bellefeuille as Dike House Resident (uncredited)
Joe Cali as Reporter (uncredited)
Jesse Christensen as Reporter (uncredited)
Rob DiNinni as Reporter #4 (uncredited)
Stephen F Feeley as Funeral guest / mourner (uncredited)
William Galatis as Shiretown Inn Guest (uncredited)
John Hawe as Stephen Sorenson (uncredited)
Bobby Kenney as Investigative News Reporter (uncredited)
Dov Kling-Levine as Protester / Local (uncredited)
Jimmy Malcolm as News Photographer (uncredited)
Jason Mulcahy as Reporter (uncredited)
Anthony Pelton as Plymouth Pennsylvania Polic Officer (uncredited)
Bill Porter as Investigative News Reporter (uncredited)