Henry Fonda
Robert Leffingwell
Charles Laughton
Senator Seabright Cooley
Don Murray
Senator Brigham Anderson
Walter Pidgeon
Senate Majority Leader
Peter Lawford
Senator Lafe Smith
Gene Tierney
Dolly Harrison
Franchot Tone
The President
Lew Ayres
The Vice President
Burgess Meredith
Herbert Gelman
Eddie Hodges
Johnny Leffingwell
Paul Ford
Senator Stanley Danta
George Grizzard
Senator Fred van Ackerman
Inga Swenson
Ellen Anderson
Frank Sinatra
Self (voice)
Edward Andrews
Senator Orrin Knox
Paul McGrath
Hardiman Fletcher
Will Geer
Senate Minority Leader
Betty White
Senator Bessie Adams
Tom Helmore
British Ambassador
Paul Stevens
Louis Newborn
Russ Brown
Night Watchman Mike
Malcolm Atterbury
Senator Tom August
Michele Montau
Celestine Barre
J. Edward McKinley
Senator Powell Hanson
Larry Tucker
Manuel
Sid Gould
Bartender
Roger Clark
Senator (uncredited)
Cay Forester
President's Secretary (uncredited)
Kenner G. Kemp
Senate Chamber Reporter (uncredited)
Harold Miller
Senate Official (uncredited)
Sol Murgi
Senator (uncredited)
Walter Reed
Senate Staff Clerk (uncredited)
Jeffrey Sayre
Senate Staff Clerk (uncredited)
Hal Taggart
Senator (uncredited)
