2004Final results
2004 election for Illinois's 12th District
U.S. House · Illinois
Jerry F. Costello (D) won with 69.5% of the vote, defeating Erin R. Zweigart (R) by 40.6 points.
Jerry F. CostelloDemocrat · winner
69.5%198,962
Erin R. ZweigartRepublican
28.9%82,677
Walter B. SteeleLibertarian
1.7%4,794
286,435 votes
Source: MIT Election Data and Science LabUpdated Sep 30, 2026, 7:25 AM ET
The seat over time
D − R margin in this seat's races around 2004
Races before and after
Source: MIT Election Data and Science LabUpdated Sep 30, 2026, 7:25 AM ET
Money in this race
Each line compares the two campaigns on one scale.
Jerry F. CostelloErin R. Zweigart
$924.9K
Raised by the campaign
$16.2K
$637.6K
Spent by the campaign
$16K
$1M
Cash on hand
$245
Campaign money: FEC, through Dec 31, 2004.
Source: FEC campaign filingsUpdated Dec 31, 2004