He made a DEAL that his own attorney took to the DA.
I don't think that part in bold has been established, has it?
Why would he want to spend his time and energy (in...oh, I don't know, but let's say October, 2006) to fight this?
And, if the Feds had a strong, open and shut case, they never would have accepted the deal.
Please don't underestimate the political witch hunt at the core of this "investigation".
You cannot possibly believe the prosecutor would not be salivating at the chance to hobble Rush with a show trial if he had the slightest evidence of anything wrong, do you? What does Rush have to do? Continue going to his personal doctor? Not commit a crime for 6 months? I consider those as normal and sane activities.