“I am cautiously optimistic that the dynamic in the General Assembly is different. I do not believe that the speaker is as powerful and dominant and domineering as he was four years ago and as he has been for much of the last 35 years. I think there’s more willingness within his caucus to stand up and challenge him on issues,” said Rauner, who has spent millions of dollars over the past four years attacking Madigan, who also is state Democratic Party chairman.