Tammy Duckworth won with 54.9% of the vote (3,012,940 votes), ahead of Mark Kirk with 39.8% (2,184,692 votes).
The margin between the first two candidates was 15.1 percentage points (828,248 votes). The party margin (Republican share minus Democratic share) was a Democratic lead of 15.1 points.
Compared with the previous comparable race in the same area, the party margin moved 4.2 points toward Democrats.
5,491,878 votes were counted in this race, for 4 candidates or options.
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