FreeState Justice continues to push issue in Md.
āA historic momentā for state
LGBT advocates say letter is 'green light' for clerks to distribute licenses statewide
Joins several other states in pushing measure
One expert says HRC's goal 'completely unrealistic'
Last push by supporters as legislative session ends today
Social conservatives tried to force him out of the position in March after he backed gay marriage
Measure passed by 34-21 vote margin
A full Senate vote is expected to take place on Valentineās Day
Senate committee last week advanced measure before legislative session ended