A push to legalize gay marriage in Colorado took a big step on Wednesday when a proposed ballot measure cleared the state title board, the AP reported.

The 3-member board charged with approving proposed ballot questions voted unanimously in favor of the measure. Proponents now must collect roughly 86,000 signatures to secure a spot on the 2012 ballot.

If approved, the measure would strike the state's 2006 voter-approved constitutional amendment banning gay marriage and replace it with new language that defines marriage as the union of two people.

Nineteen-year-old political science student Mark Olmstead is one of the sponsors of the proposed change.

“I feel like it's time to start fighting for it here,” said Olmstead, who is gay but does not have any immediate plans to marry. “I think Colorado has changed from then to now. I'm not entirely sure it's changed enough, but it's about time to start talking about it.”

A civil unions bill died in a House committee earlier this year after passage in the Senate.

Opponent of marriage equality said they believe voters will retain the law.

“We have every confidence that the people of Colorado would affirm that vote again if an attempt to repeal marriage comes to the ballot,” said Carrie Gordon Earll of Focus on the Family.