Republicans retained the only state Senate seat up in Tuesday's election.
Dustin Blanchard has the story from the state Capitol.
Republican Representative Scott Rupp beat Democrat Representative Wayne Henke in the election for the St. Charles County seat.
The district came into contention after Senator Jon Dolan resigned in November.
Governor Blunt says he views the win as a referendum on his administration.
But Democratic Senator Pat Dougherty attributes his party's loss to being outspent by Republicans.
Rupp won with almost 54 percent of the votes.
From the state Capitol, I'm Dustin Blanchard
Republican Representative Scott Rupp won the St Charles County seat with nearly 54% of the vote.
Democratic Senator Pat Dougherty says the results came down to campaign spending in the contentious race.
Governor Blunt says he views the win as a positive referendum on his administration.