The sweeping federal corruption investigation threatens to derail Gov. J.B. Pritzker’s progressive tax hike amendment, which voters will decide Nov. 3.

Illinois’ high levels of corruption damage the state’s economy, costing it $10.6 billion since 2000. States with higher levels of corruption average lower levels of economic growth.

Federal investigators are looking into Illinois House Speaker Michael Madigan’s relationship with multiple corporations.

The Illinois House speaker was implicated in criminal charges filed against electrical company ComEd.

Government corruption is nothing new for Illinoisans. Illinois is the second-most corrupt state in the nation, according to research by the University of Illinois-Chicago. And corruption costs the state economy more than $550 million per year. What is new? Powerful Illinois lawmakers, Chicago aldermen, local mayors and business interests are involved in what appears to be...