I believe this is entrirely mislabeled. There is no investigation of Quinn himself. This is the investigation of an anti-violence program funded by a grant from the Quinn administration just prior to the 2010 election, and the people who directly recieved those funds--including the spouse of the Cook County Register of Deeds.
It may not be investigating Quinn himself, but if it uncovers any criminal activity by his advisers, then that will be enough to damage him, even despite Rauner's own baggage.
