While Constitutional ballot measures typically require a 55% vote to pass in Colorado, Amendment J only needed a simple majority.

Following a 2014 decision by the Colorado Supreme Court, Attorney General John Suthers declared that County Clerks within the state could not deny couples marriage licenses on the basis of sex.

[3] On June 26, 2015, the US Supreme Court ruled in the case Obergefell v. Hodges which struck down same-sex marriage bans nationwide.

The amendment was passed by voters, removing language from the Colorado Constitution stating that marriage is exclusively between a man and a woman.

However, the official state voter guide offered as an argument that marriage should be between one man and one woman and if Obergefell v. Hodges is overturned, the Colorado Constitution should reflect that.