Mark Steven Kirk won with 48.0% of the vote (1,778,698 votes), ahead of Alexander \Alexi\ with 46.4% (1,719,478 votes).
The margin between the first two candidates was 1.6 percentage points (59,220 votes). The party margin (Republican share minus Democratic share) was a Republican lead of 1.6 points.
Compared with the previous comparable race in the same area, the party margin moved 40.9 points toward Republicans. The winning party changed.
3,704,473 votes were counted in this race, for 5 candidates or options.
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