It’s a tough job lending immeasurable star power to American Idol’s farewell season, but someone’s gotta do it before the whole thing goes down in flames April 7. Welcome back to Judging the Judges, our weekly power ranking* of Keith Urban, Jennifer Lopez, and Harry Connick Jr. during the final Idol-sponsored round of their ongoing quest to become the greatest self-promoter this world has ever seen. *Unlike Harry Connick Jr.’s systematic refusal to play along, the Judging the Judges points system is 100 percent arbitrary and subject to change. KEITH URBAN 500 vulnerability points go to the gooey moral center of the Idol judging panel for re-tapping his well of tears from Kelly Clarkson’s gut-wrenching performance of “Piece by Piece” last week.