The total includes $3 million raised by Brown’s campaign, and about $600,000 raised by the Democratic Senatorial Campaign Committee and the Ohio Democratic Party.

Brown, a Democrat who was unseated last year in a close race, also considered running for governor but instead will challenge Republican Sen. Jon Husted.

Former Sen. Sherrod Brown of Ohio announced Monday he is launching a comeback bid, giving Democrats a boost in their longshot campaign to win back control of the Senate.