Why Hasn't William Jefferson Been Charged?

In review the culture of corruption roster, it struck me that the only prominent Democrat on the list sure has been under investigation for a long time.

Jeebus, it was in August of 2005 that Jefferson was discovered hiding the $90,000 in marked bills in his freezer.

In the purge scandal, we have learned how the Bush administration was pressuring US Attorneys around the country to place politics above integrity and justice. You were punished if you prosecuted corrupt Republicans or if you failed to pursue any nit involving a Democrat for full political gain. The ones that didn't go along got fired.

With these relevations, I feel its safe to speculate that Jefferson isn't being charged because he is the only albatross the Republicans can hang around the Democrats' neck. Without him around, they have nothing to support their argument of a phony equivalence in corruption between the Republican throng of unethical Congressmen and the Democrats' corruption as represented by Jefferson.