11/07/2012 10:58 am EST
Sen. Jon Tester (D-Mont.) won re-election against Rep. Danny Rehberg (R-Mont.), projected the Associated Press on Wednesday morning.
Tester had a tough reelection challenge against Rehberg, with the race virtually tied throughout its duration.
Tester won election in 2006 in a Democratic wave, and was a prime target for Republicans in their hopes to take over the Senate.
At the presidential level, Romney won the state by 13 points.
The race incurred nearly $30 million in outside spending, with a majority of the cash favoring Rehberg. 89,000 television ads ran in the state from June to October, according to the Wesleyan Media project, more than any other race in the country.