Former Florida Gov. Jeb Bush was expected to appear Thursday with Brady in Chicago after a fundraiser in Bloomington on Wednesday for the downstate lawmaker.
Bush is the brother of former President George Bush.
Democratic Gov. Pat Quinn was quick to take a swipe at Brady for leaning on the Bush family for political support.
Quinn told reporters Wednesday that it was "insulting" to the people of Illinois for Brady to bring in a member of the Bush family to cheerlead for him.
Quinn says former President Bush ran the nation's economy "into the ground."
During yesterday's private event for Brady, Quinn's running mate Sheila Simon held a rally called "Keep Bushonomics Out of Illinois" at a Bloomington Union Hall.