All second runner ups are more famous than the winner. Lol.
The curse of the American Idol Winner has been in place for a long time. The "Winner" is doomed to obscurity while the runner-up gets fame and fortune by their own merits long after the "Winner"'s AI Record Deal is finished and by then the "Winner" can't find anyone else for a record deal, or in the case of Ruben Studdard, ruined his career and life with a drug-bust.
Clay Aiken and Adam Lambert are the most well-known American Idol runners-up because they've made it big on talent and popularity, while the "Winners" of their respective seasons merely had popularity with the teenage girls and other people who could afford to vote a hundred thousand times but not buy their one or two albums, while Clay and Adam were so talented and popular that people snatched up their albums like federally-regulated and taxed Marijuana out of a tobacco shop/liquor store.
And I admit, Adam Lambert's music might not be my favorite style of music, but he's fun to listen to regardless.
Except for winners of season one, three and four, who are Kelly Clarkson, Carrie Underwood and Fantasia Barrino (kinda).