No wonder why he has disappeared from the radar again. This was done repeatedly during the campaign, while he made one on one press conferences avaliable to Dupage county voters. That's why Quinn caught up. Good luck with strategy Gov, its not working.
Rauner is invisible in Chicagoland because he's hitting Metro East hard this week. It's a big state and Chicago media doesn't necessarily cover events in the 90+ counties outside of its main area.
As for the polls, I would remind everyone about how Kasich started out four years ago (story from 5/19/11). Note that in Apr 2011 Kasich had only a 30% approval.
Kasich only won re-election by such a large margin because he faced one of the weakest Gubernatorial nominees in the history of Ohio Democratic politics in the biggest Republican wave since at least the 1890s and ran an excellent campaign. It's almost impossible to imagine Rauner finding himself in an even somewhat similar situation in 2018.