In the Ohio race, incumbent Sherrod Brown defeated Republican State Treasurer Josh Mandel.
Former Dayton Daily News editor Ellen Belcher says when Mandel decided to run against Brown, not many people gave him a chance - but when money started pouring in, the tide started turning.
"Its been up and down and there were moments when people thought Sherrod Brown could actually lose this. I think this is one of those times where those who think that money can't buy an election are proven right," says Belcher.