Billionaire Democrat J.B. Pritzker defeated Republican Gov. Bruce Rauner Tuesday to become the next governor of Illinois.
Networks called the race for Mr. Pritzker, an heir to the Hyatt hotel chain, shortly after polls closed.
Mr. Rauner, 61, came into office four years ago promising to cut taxes and reduce spending, but became embroiled in a budget stalemate with Democrats in the legislature.
The last time an incumbent governor lost a reelection bid in Illinois was in 1976.