Kelly fans tend to note that most of the time when someone sings a Kelly Clarkson song on a singing show, they get voted off or land in the bottom two. I've noticed that this also happens to people who sing Lady GaGa.

Who's curse is bigger?

Kelly

Gaga remains flawless

Explain Cassadee Pope.

She's a genius for following Kelly, Avril and Michelle

I said in the OP that MOST of the time singing Kelly works against them. Cassadee is one of the few exceptions.

Almost everyone who dare to sing a Kelly's song is voted off eventually. It works even in such a flop country (when it comes to music) like the Czech Republic so I say Kelly's one.