Democrats have significant leads over their Republican opponents in both Illinois’ U.S. Senate contest and the race for president, according to a new poll by the Paul Simon Public Policy Institute.

The Simon Poll also gauged voters’ opinions of Gov. Bruce Rauner, House Speaker Mike Madigan and Senate President John Cullerton, finding a strong majority of Illinois voters disapprove of the way state political leaders have been doing their jobs. But if there can be an edge in approval, it belongs to Rauner.

The normally low-profile race for Illinois comptroller, which has been characterized as a proxy war between Republican…