Voters on Tuesday were overwhelmingly in favor of repealing the Colorado Constitution’s now-defunct marriage definition that only recognizes unions between a man and a woman.

As of 8:45 p.m., “yes” on Amendment J has received 64% of the more than 2.1 million votes tallied thus far.

The measure would repeal the language in the state’s constitution that limits valid marriages to those between a man and a woman. A 2006 voter-approved amendment put that definition into the constitution.

The issue, though, has been moot since a 2015 U.S. Supreme Court ruling legalized same-sex marriages.

Proponents for this year’s amendment — including the American Civil Liberties Union of Colorado, Planned Parenthood of the Rocky Mountains and Democratic U.S. Sen. Michael Bennet — argued those unions could be at risk if the U.S. Supreme Court considered overturning past rulings.

Opponents — such as the Colorado Catholic Conference — contend marriage should be based on biological reproduction between a man and a woman. The constitution’s current definition should be retained, they argued, should the courts reconsider a different stance on same-sex marriage in the future.