A question from TPM Reader PE: "Did Sampson ever explain how names got put on the list? Who was responsible for that? It seems he just kept saying he just kept the list."
No. No. And you're right.
A slightly longer answer would be that on every delicate particular Sampson said that he was collecting viewpoints from various administration officials about their views on particular US Attorneys but that he couldn't remember specifics and that no one issue was ever determinative. He also said whatever records or notes he kept about the process likely no longer exist.