The Columbus City Council on Monday unanimously approved a resolution supporting marriage equality in Ohio.

“There was a time in this state where a city council would never dare to pass a resolution like this,” said Michael Premo of Why Marriage Matters Ohio, a statewide campaign to increase support for allowing gay and lesbian couples to marry in the Buckeye State.

According to Premo, Columbus is the “first municipality in the state of Ohio” to approve such a resolution.

Voters in Ohio approved a constitutional amendment defining marriage as a heterosexual union in 2004. Last month, the Sixth Circuit Court of Appeals in Cincinnati overturned a lower court's ruling striking down the ban as unconstitutional. Plaintiffs in the case have asked the Supreme Court to review the decision.

(Related: Ohio AG Mike DeWine asks Supreme Court to uphold gay marriage ban.)

While Columbus is considered Ohio's most liberal big city, Cincinnati recently scored 100% on the Human Rights Campaign's third annual Municipal Equality Index (MEI), which measures a city's support for LGBT rights.