Residency Requirements and Politics

Apparently in the state of Illinois if you intend to return, no mater how long you live out of state, or if you have family there you can run for public office without actually living in the state. Chicago politics have kind of seemed off to me. In their decision the Illinois supreme court said this has always been the way it has been, so I haven't lived there for 3 years I can run for mayor of Chicago cause I visited at Christmas