The Republican candidate Tuesday said the airport issue "hangs like a cloud" over Illinois politics. He offered no specifics but seemed to suggest that political bickering over jobs and contracts rather than illegal payoffs was what he meant by corruption.
O'Hare International Airport is beset by delays, and federal officials are pushing for a solution. Mayor Richard Daley wants to expand O'Hare, while Republicans want to build an airport at Peotone.
A spokesman says Democratic Barack Obama favors a compromise under which O'Hare would be expanded and a new airport built. Keyes says he hasn't yet decided what he'd propose.