The Maryland Legislature has passed a law to allow gay marriage by a 25-22 margin on Thursday, less than a week after the House of Delegates barely passed the measure.
Maryland is now set to join six other states and the District of Columbia in allowing same-sex marriage when Gov. Martin O'Malley, who sponsored the bill, signs the legislation.
In a statement after the vote, the governor said "all children deserve the opportunity to live in a loving, caring, committed and stable home, protected equally under the law."
Opponents vow to bring the measure to voters with a referendum. Now that the bill has passed the Senate, organizers can begin collecting the more than 55,000 signatures needed to put it on the ballot.
Smithonian's Air and Space Museum was the scene of protests on Thursday as part of a national push by fast food workers for higher wages.