Illinois state Sen. Jim Oberweis (R) has won his Senate primary and will face Senate Majority Whip Dick Durbin (D-Ill.) in the fall.
The newly minted nominee has previously lost races for Senate, governor and U.S. House.
He outspent Truax, the early favorite of establishment Republicans, by a wide margin in the primary. But Truax got a late boost in the race after Oberweis left the state for a trip to Florida for his wife's birthday last week, days before the primary.
In the solidly Democratic state, Oberweis begins the race as the prohibitive underdog against Durbin.
— This post was last updated at 10:15 p.m.