Fact is, the Illinois State Legislature is dominated by Democrats to the point of Super-Majority status in both houses of the legislature.
If all Rauner does is prevent them along with Mike Madigan (IL Speaker of the House, lifetime career politician and Democrat) from making the 66% tax increase Quinn passed 4 years ago permanent and rolls it back, I'd consider a Rauner Governorship to be successful.
Madigan is afraid. That’s why he’s pushing the entire class warfare scheme. Rauner will have a bully pulpit. He can call them out on spending and corruption.
It will kill their super-majority because it’s held together by money and favors. That’s the start of the crack. He’s seen what has happened in Michigan, Wisconsin and Indiana.
Once that door opens and the voters see they have an alternative it’s lights out. That said, this is Illinois. They’re as likely to reelect Quinn as they are to breathe.