On March 22, the Illinois Supreme Court issued this opinion in Wisnasky-Bettorf v Pierce, 111253. The unanimous opinion says that when a qualified party nominates a candidate after the primary (because that party hadn’t nominated anyone at its primary), it does not need to notify election authorities within three days after deciding to make such a nomination.
The lower courts had kept a Republican nominee for office off the ballot in November 2010 because the lower courts thought that the law required such a notification.