Sponsors include Mark Olmstead, a 19-year-old college student inspired by the recent passage of the marriage equality law in New York. Their effort follows an attempt to remove the constitutional amendment in 2010 that failed to garner enough signatures.

According to the AP, gay rights groups including One Colorado continue to believe the issue should be addressed by the legislature. An attempt to pass civil unions legislation failed in the Republican-controlled House earlier this year. One Colorado said it was focused on improving the chances for civil unions in the legislature.