BALTIMORE (AP) — A coalition of African-American churches is holding a prayer vigil to highlight its members' opposition to gay marriage and urge Marylanders to vote against it.

Members of the National Black Church Initiative will gather to pray at Israel Baptist Church in east Baltimore on Wednesday.

Maryland Gov. Martin O'Malley signed a bill legalizing gay marriage this year, but the measure has yet to take effect. Voters will decide the issue in a referendum this fall after opponents launched a successful petition drive. Some black churches are pushing for voters to reject gay marriage in the state.

The initiative says it's planning several prayer vigils on the issue.