On the basis of prosecutorial misconduct including witness tampering.
Richard Scrushy’s legal, who was convicted in the same case, is asking the U.S. District Judge Mark Fuller, who originally heard the case, because, he participated in ex-parte discussions with the prosecution about juror misconduct, and so might be called as a witness.
I have little faith in anything here, except the Barak Obama and His Clueless Minions™, will do nothing to investigate the truth, because, hell, I don’t know why, but the misconduct here is far worse than what got Ted Stevens off.