David Cassidy
From Jenny Everywhere Wiki
David Cassidy was a celebrity. In one universe, he became President of the United States of America, an idea which seemed ludicrous in at least one another dimension in which his name was known. (COMIC: Tribute) His administration seems to have been musically memorable; in at least one universe people could get CDs of his inauguration. (PROSE: Cleaning Day)
Behind the scenes
In our universe he was a singer and actor, playing Keith Partridge on the 1970s sitcom The Partridge Family and becoming a teen idol — but never president.