Could Federal Prosecutorial Misconduct Free Edwin Edwards?

Patterico has some questions:

Did a prosecutor in the New Orleans U.S. Attorney’s Office commit misconduct which could jeopardize the conviction of former Louisiana governor Edwin Edwards? Did a defendant who turned state’s evidence against Edwards bribe Congressman William Jefferson to influence the former U.S. Attorney to get a better deal for himself? Did the Department of Justice ignore evidence of these claims?

These are the allegations made by an indicted attorney. In a lengthy post, Patterico finds the allegations plausible and worth further investigation.