More Ohioans oppose the legalization of gay marriage than support it, a new poll has found.

A Quinnipiac University survey of 1,165 registered voters released on Wednesday found that 45 percent of respondents support marriage equality, while 47 remain opposed. Nine percent refused to answer.

Opposition is highest among Republicans (70%). Independents appear divided, with 47 percent opposed and 42 percent in favor. A large majority of Democrats (64%) said they support such unions.

The poll also found a majority of African-Americans (55%) in favor of marriage equality. Thirty-six percent said they were opposed.

The survey runs counter to an October poll conducted by The Washington Post which found a slim majority of Ohioans (52%) in support of gay nuptials, with only 37 percent opposed.

Marriage equality supporters earlier this year began an effort to repeal Ohio's 2004 voter-approved constitutional amendment limiting marriage to heterosexual couples. The group Freedom to Marry Ohio is collecting signatures to put the question on next year's ballot.

(Related: Ohio gay marriage foes organize to defend ban.)