Jason Clarke

Ted Kennedy

Kate Mara

Mary Jo Kopechne

Ed Helms

Joseph Gargan

Bruce Dern

Joseph Kennedy

Jim Gaffigan

Paul Markham

Olivia Thirlby

Rachel Schiff

Clancy Brown

Robert McNamara

Taylor Nichols

Ted Sorensen

John Fiore

Chief Arena

Katie Henoch

Suzy

Lexie Roth

Nance Lyons

Angela Hope Smith

Maryellen Lyons

Vincent Tycer

David Burke

Victor Warren

Stephen Smith

David De Beck

Sargent Shriver

Matthew Lawler

Dun Gifford

Beth Petrou

Ann Gargan

Thomas Kee

Walter Steele

Andria Blackman

Joan Kennedy

Donald Watson

Dr. Watt

Walter Driscoll

Dr. Mills

Joseph Zamparelli

Officer Look

Charlotte Dore

Gwen Kopechne

Tim Jackson

Joseph Kopechne

Damien Di Paola

Ray LaRosa

Ed Peed

Eugene Frieh

Bill Humphreys

James Reston

Gary Tanguay

TV Interviewer

Diana Boudreau

Police Secretary

Alison Wachtler

Liz Trotta

Tony Viveiros

Floor Producer

Tamara Hickey

Marilyn Richards

Nancy O'Brien

Neighbor

Tom O'Brien

Neighbor's Husband

Sarah Elizabeth Mitchell

Senate Secretary

Michele Proude

Vicki

Michael Fennimore

Chief of Staff

Dustin Tucker

Senatorial Aide

Bob Jaffe

Reporter #2

Paul Pape

Dick Drayne (voice)

Jake Head

James Smith (voice)

Chris Edgerly

Edmund Dinis (voice)

Wally Wingert

Newscaster (voice)

Piotr Michael

Newscaster (voice)

Bill Mootos

Older Reporter

Jody Ebling

Ethel Kennedy

Philip Dorn Hebert

Jack Crimmins

Rick Hamilton

Ferry Captain

Paul Taft

Vineyard Gazette Photographer

David Callanan

Charles Tretter

Thomas Whitestone

Organist

Patrick Sheehan

Lawyer

Jeff Savage

John Culver

Ed O'Keefe

Funeral Priest

Thomas Brogan

Edgartown Policeman

Charles Mathison

Admin Worker

Michael Swanson

Security Agent

Nathan Bruckler

Tow Truck Driver

Camille Faman

Female Employee

Carrie Ann Quinn

RMV Attendant

Susan Garfield

Senate Staffer (uncredited)

Marinko Radakovic

Reporter

Paul Bellefeuille

Dike House Resident (uncredited)

Joe Cali

Reporter (uncredited)

Rob DiNinni

Reporter #4 (uncredited)

Stephen F Feeley

Funeral guest / mourner (uncredited)

William Galatis

Shiretown Inn Guest (uncredited)

John Hawe

Stephen Sorenson (uncredited)

Bobby Kenney

Investigative News Reporter (uncredited)

Dov Kling-Levine

Protester / Local (uncredited)

Jason Mulcahy

Reporter (uncredited)

Anthony Pelton

Plymouth Pennsylvania Polic Officer (uncredited)

Bill Porter

Investigative News Reporter (uncredited)

Harold Rudolph

Funeral attendee (uncredited)

John Sarnie

Mourner (uncredited)

Sigrid Lium

Senate Staffer (uncredited)