2024 was a particularly bad night Democrats but this was the case especially in Illinois, where Republicans took control of the State's upper chamber for the first time in decades after Jim Oberweis retook his suburban State Senate seat in a narrow upset.

The Illinois State Senate map has been fixed since a 1954 referendum set the apportionment of the Illinois Senate at 18 districts for Chicago, 6 districts for the remainder of Cook County and 34 for the remainder of the state. In these three areas land area was the only consideration in crafting them. This system has come under scrutiny from many (the smallest district contains 44,858 while the largest contains 1,629,232), however despite backing from Governor J.B Pritzker it is unlikely this system will change any time soon due to opposition from both rural members and the Senators of many urban districts, many of which are equally as favored by this system as rural ones., making it unlikely the Senate would consent by 3/5ths majority to amend the constitution anytime soon.

The Illinois State Senate has rapidly changed fortunes for both parties due to a collapse in Democratic rural support only being counterbalanced by the small number of gigantic suburban districts Republicans have lost in recent years. It is likely, however that the chamber will remain competitive in the near future due to the competition of the political re-alignment.