The civil unions bill is expected to sail through the Senate and then head to the House, where ruling Republicans defeated the measure the last two years.
Democrats now control the House and vow speedy approval.
Democratic Gov. John Hickenlooper urged lawmakers last month to move quickly on civil unions. His signature would make the change complete, seven years after voters banned gay marriage in the state constitution.
This material may not be published, broadcast, rewritten, or redistributed.
Filed under: Colorado