Ohio's attorney general certified a petition for a state constitutional amendment that would repeal the 2004 voter-approved amendment banning same-sex language.
The repeal amendment, backed by the Ohio Freedom to Marry Coalition, defines marriage as "a union between two consenting adults, regardless of gender."
According to the Columbus-Dispatch, the measure allows churches to refuse to perform same-sex marriage.
The state ballot board is deliberating whether the repeal amendment should be placed on the ballot as one measure or divided between two.
Meanwhile, the coalition is trying to gather 385,253 voter signatures, the amount needed to put the amendment on the ballot in 2013.