2010Final resultsSpecial election
2010 special election for U.S. Senate in Illinois
U.S. Senate · Illinois
Mark Kirk (R) won with 48.0% of the vote, defeating Alexi Giannoulias (D) by 1.6 points.
Mark KirkRepublican · winner
48.0%1,778,698
Alexi GiannouliasDemocrat
46.4%1,719,478
Lealan M. JonesGreen
3.2%117,914
Mike LabnoLibertarian
2.4%87,247
3,704,473 votes
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.
Alexi GiannouliasMark Kirk
$9.9M
Raised by the campaign
$14.4M
$9.9M
Spent by the campaign
$14.1M
$21.6K
Cash on hand
$305.8K
Campaign money: FEC, through Dec 31, 2010.
Source: FEC campaign filingsUpdated Dec 31, 2010
The candidates
Mark Kirk (R)Alexi Giannoulias (D)
Also on the ballot: Lealan M. Jones (Green), 3.2%; Mike Labno (Libertarian), 2.4%