Bush is head of the justice department that would initiate any criminal investigation into Cheney's actions. His claim that Cheney will be exhonerated is not only grossly improper it smacks of a prediction of which he is powerfull enough to sway the outcome.
When the man who dictates what goes on at Justice predicts that the investigation will turn up nothing, it's pretty much an indication that Cheney is above the law. Hope that helps.
That, of course, is your opinion.
I see you don't leave any room at all for the fact that Cheney is more than likely INNOCENT, do you? Wouldn't suit your agenda.