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

Gillian Mariner Gordon

Cricket

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

Barry Press

Burke Marshall

Matthew Lawler

Dun Gifford

Beth Petrou

Ann Gargan

Thomas Kee

Walter Steele

Andria Blackman

Joan Kennedy

Donald Watson

Dr. Watt

Walter Driscoll

Dr. Mills

Joe Chase

John Farrar

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

Sean Patrick Hopkins

Ross Richards

Tamara Hickey

Marilyn Richards

Nancy O'Brien

Neighbor

Tom O'Brien

Neighbor's Husband

Noah Carpenter

Teddy Jr.

Sarah Elizabeth Mitchell

Senate Secretary