ILLINOIS -- Republican Jim Oberweis is set to go up against US Senator Dick Durbin in November.
Oberweis' defeated his rival, Douglas Truax, by almost 80,000 votes.
Oberweis was the favorite going into Tuesday's primary.
"This is not gonna be an easy race, but this is a winnable race," said Oberweis on Monday. "This is the first time we've had a real serious opportunity to do so. Mr. Durbin has had a couple of fairly easy elections in the past. I'm gonna make sure he doesn't this time."