Sigh. I guess I'll go with the popular consensus and say Megan Joy.
I don't think Megan was the worst Tuesday, but she did sing the least recognizable song. And I'd guess she doesn't have as devoted a fan following as Lil or Scott -- the two singers I ranked at the bottom of the pack.
DialIdol, the Web site that measures busy signals, has Megan at the very bottom, right behind Allison and Anoop.