Sherrod Brown didn't do as well in Ohio's population-dense metro regions as he had in the past, and that performance — in areas he needed to overcome the state's increasingly conservative bent — helped propel former car salesman Bernie Moreno to victory.

Brown is seeking reelection against Republican businessman Bernie Moreno in the nation's costliest U.S. Senate race. Republicans and Democrats spent nearly $477 million on the race, according to AdImpact, making it the most expensive non-presidential contest on record.

Ohio's $467 million U.S. Senate race is now the most expensive non-presidential contest on record, according to AdImpact.

Republicans flipped two Senate seats on Tuesday, as Republican Ted Cruz won a third term in Texas. Democrat Angela Alsobrooks was declared the winner in Maryland's open Senate seat race.

The nationally-watched race between Sen. Sherrod Brown and Bernie Moreno could determine which party controls the Senate.

Republican Bernie Moreno addressed supporters after winning the Ohio Senate race and unseating Democrat Sen. Sherrod Brown.

Republican Bernie Moreno has won the Ohio Senate race, defeating Sen. Sherrod Brown, the incumbent Democrat, according to a race call by the Associated Press. It is a major victory for Republicans and a serious blow to Democrats’ efforts to maintain their majority in the Senate.

With the victory of Bernie Moreno, a wealthy former car dealer and political novice, Republicans had enough seats to win the Senate majority unless Democrats scored an upset.