Democratic Congressman Bill Foster will keep the formerly GOP seat he won earlier this year in a special election.
Foster beat Republican businessman Jim Oberweis in Illinois' 14th Congressional District in the race to hang on to former House Speaker Dennis Hastert's old district.
With 65 percent of precincts reporting, Foster had 57 percent and Oberweis had 43 percent.
Foster is a Geneva physicist who first went to Washington in March after beating Oberweis in a special election to fill the remainder of Hastert's term after he retired.
The district stretches from the far-western Chicago suburbs to almost to the Mississippi River.