2004Final results
2004 election for Illinois Legislative District 26
Illinois State Senate · Illinois
William E. Peterson (R) won with 61.1% of the vote, defeating Nancy L. Peterson (D) by 22.2 points.
William E. PetersonRepublican · winner · incumbent
61.1%59,361
Nancy L. PetersonDemocrat
38.9%37,760
97,121 votes
Source: Harvard Dataverse / Carl KlarnerUpdated Sep 30, 2026, 7:29 AM ET
The seat over time
D − R margin in this seat's races around 2004
Races before and after
Source: Harvard Dataverse / Carl KlarnerUpdated Sep 30, 2026, 7:29 AM ET