2020Flipped from DemocraticFinal resultsIncumbent defeated
2020 election for Illinois Representative District 51
Illinois House of Representatives · Illinois
Chris Bos (R) won with 50.9% of the vote, defeating Mary Edly-Allen (D) by 1.7 points, a seat Democrats won last time.
Chris BosRepublican · winner
50.9%33,697
Mary Edly-AllenDemocrat · incumbent
49.1%32,548
66,245 votes
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 10:09 AM ET
The seat over time
D − R margin in this seat's races around 2020
Races before and after
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 10:09 AM ET