Stratton, Illinois' current lieutenant governor, and Tracy, a Springfield attorney and former chairman of the Illinois Republican Party, made their cases before a live studio audience.
Johnson is not proposing a property tax increase, but he is seeking a corporate head tax that a majority of alderpersons rejected last year and have pledged to oppose again.
Federal officials are investigating after a flight arriving from Barcelona experienced a tire blowout following a reported brake issue while landing at O'Hare.