Alan Alda as Joe Tynan

Barbara Harris as Ellie

Meryl Streep as Karen Traynor

Rip Torn as Senator Kittner

Melvyn Douglas as Senator Birney

Charles Kimbrough as Francis

Carrie Nye as Aldena Kittner

Michael Higgins as Senator Pardew

Blanche Baker as Janet

Maureen Anderman as Joe's Secretary

Chris Arnold as Jerry

John Badila as Reporter on TV Screen

Robert Christian as Arthur Briggs

Maurice Copeland as Mr. Edward Anderson

Lu Elrod as Congresswoman at Party

Clarence Felder as Golf Pro

Gus Fleming as Eric

Merv Griffin as Himself

Marian Hailey as Sheila Lerner

Dan Hedaya as Alex Heller

Ronald Hunter as TV News Director

Walter Klavun as Waldorf M.C.

Norman La Rochelle as Oscar Harris

Kaiulani Lee as Angela

Charles Levin as John Cairn

Christopher McHale as Bert – Radio Aide

Ron Menchine as Senator Aikers

Michael Miller as Reporter Tom

Bill Moor as Barry Traynor

Novella Nelson as Carla Willis

Stephen D. Newman as Congressman Wayne Tiller

Eric Pederson as Waiter

Wyman Pendleton as Dick Harman

Don Plumley as Clerk at Golf Resort

Ben Prestbury as Servant

Adam Ross as Paul Tynan

Frederick Rolf as Harvard Professor

Peter Henry Schroeder as Ned (The Senator)

William Shust as Ned Townes

Cathy Simpson as TV Station Secretary

Martha Sherrill as Woman at Golf Resort

Ben Slack as Man in T-Shirt

Leon B. Stevens as Senator Hamer

Frank Stoegerer as Reporter

Suzanne Stone as Reporter

Kay Todd as Woman at Party

Jeff R. Wallace as Elevator Operator

Nathan Wilansky as Senate Clerk

Joe Cipriano as Photographer (uncredited)

T.G. Finkbinder as Senate Aid (uncredited)

Stephen Frazier as Senator's Aide (uncredited)

Frank Kahlil Wheaton as Senate Aide (uncredited)