Yeah, but it's RedState. Erick Erickson specializes in saying completely crazy things. Andrew Sullivan linked to it to point out that it was completely crazy, but I haven't seen any mention of Levi Johnson's sister anywhere else, and I just went looking at a bunch of sites that mainly exist to make fun of conservative blogs. Sadly No is all about the mockery of Erick Erickson, but they didn't even touch this one.