Rick Brown at Historybuff.com provides some interesting information regarding a couple of known error editions, including the highly collectible “Dewey Defeats Truman ” issue of the Chicago Daily Tribune:
The Eleven Editions of the November 3, 1948 Chicago Daily Tribune 
You’ve heard of the famous error paper “Dewey Defeats Truman”. Well, they produced ten more error headlines that day.
The Story Behind the “Dewey Defeats Truman” error issue 
You’ve heard of the edition, but how did it happen? You’ll find the answer here.
The Tilden-Hayes Election of 1876 
“Dewey Defeats Truman” was not the only presidential election error headline. Here’s another one.
Thanks, Rick, for your ongoing contributions to the hobby.