More voters in Oregon support gay marriage than oppose the institution.

According to a survey of 500 voters conducted by Davis, Hibbitts & Midghall and paid for by Oregon Public Broadcasting and Fox 12, 49 percent of respondents support gay nuptials, while 42 percent remain opposed. Nine percent refused to answer.

Sixty-seven percent of voters under 35 said they support marriage equality.

Pollsters asked voters whether they “favor or oppose changing the Oregon Constitution to allow same-sex marriage in the state?”

Oregon is so far the only state committed to a 2014 referendum on the issue. If successful, the referendum would reverse the state's 2004 voter-approved constitutional amendment limiting marriage to heterosexual couples.

Oregon United for Marriage, the coalition of groups behind the effort, launched its petition drive at an event on Valentine's Day attended by Governor John Kitzhaber and former Governor Barbara Roberts, both Democrats who were among the first to sign a petition needed to qualify for the ballot.

Last month, the group released its first online video in support of next year's referendum.

(Related: Oregon gay marriage push begins.)