“All people are born alike—except Republicans and Democrats” is a jocular saying that has been printed on many images. New York City-born comedian, writer, actor and game show host Groucho Marx (1890-1977) made the remark on his television quiz show You Bet Your Life.
 
This television preview for Thursday, December 16, 1954, was printed in that day’s The Evening Sun (Baltimore, MD), with a similar preview in many other newspapers:
   
“YOU BET YOUR LIFE, Groucho talks to a jewelry salesman who admits he buys his own products. Groucho comments that if he works real hard he can build up his business to a shoestring. There’s also a reverend and his wife who’ve adopted a dozen children of different nationalities. Groucho agrees with them—‘that all people are born alike—except Republicans and Democrats, of course.’ Groucho in his usual good form, KPTV.”
   
     
Wikipedia: Groucho Marx
Julius Henry “Groucho” Marx (/ˈɡraʊtʃoʊ/; October 2, 1890 – August 19, 1977) was an American comedian, writer, stage, film, radio, and television star. He was known as a master of quick wit and is widely considered one of America’s greatest and most gifted comedians.
 
He made 13 feature films with his siblings the Marx Brothers, of whom he was the third-born. He also had a successful solo career, most notably as the host of the radio and television game show You Bet Your Life.
   
16 December 1954, The Evening Sun (Baltimore, MD), “TV Previews,” pg. 42, col. 4:
YOU BET YOUR LIFE, Groucho talks to a jewelry salesman who admits he buys his own products. Groucho comments that if he works real hard he can build up his business to a shoestring. There’s also a reverend and his wife who’ve adopted a dozen children of different nationalities. Groucho agrees with them—“that all people are born alike—except Republicans and Democrats, of course.” Groucho in his usual good form, KPTV.
     
Twitter 
Cherish Hellfire
@CherishHellfire
“All people are born alike - except Republicans and Democrats. ” - Groucho Marx
7:30 PM - 20 Jan 2008
 
Google Books
Predisposed:
Liberals, Conservatives, and the Biology of Political Differences
By John R. Hibbing, Kevin B. Smith and John R. Alford
New York, NY: Routledge
2014
Pg. 25:
Groucho Marx famously remarked that “all people are born alike—except Republicans and Democrats.”
     
Google Books
The Sarcasm Handbook
By Lawrence Dorfman
New York, NY: Skyhorse Publishing
2017
Pg. ?:
“All people are born alike—except Republicans and Democrats.” —GROUCHO MARX
 
Twitter
David Grayless
@DavidGrayless
All people are born alike—except Republicans and Democrats.
—Groucho Marx
8:54 PM - 12 Jul 2018