By a narrow margin, New Mexico’s House of Representative approved a statewide domestic partners law that would grant gay couples the same rights and benefits as married couples. The legislation must now pass the state Senate before appearing on the desk of Gov. Bill Richardson. New Mexico’s Senate Majority Leader, Michael Sanchez, D-Belen, is “cautiously optimistic” that the bill will pass in his chamber. The bill is part of Gov. Richardson’s legislative agenda. Ten states and the District Of Columbia already have similar laws on the books.