Rep. Mark Schauer (D-Mich.) will have a rematch in November against 2008 foe Tim Walberg.
The freshman Democrat took the seat from Walberg last cycle after the Republican had held it for a single term.
Walberg claimed the nod by besting attorney Brian Rooney 58-32 percent. He was declared the winner by the Associated Press. Rooney's grandfather, Art Rooney, founded the Pittsburgh Steelers.
In 2008, Schauer beat Walberg by about 7,500 votes.