Washington state’s latest expansion of domestic partnerships for gay couples was hanging in limbo Friday as opponents announced a final push to force a public vote, calling their effort so far “too close to call.” In a statement to supporters, organizers of the Referendum 71 campaign said they should have the minimum 120,577 petition signatures needed by Saturday to qualify for the ballot. But R-71 organizer Gary Randall also said the campaign doesn’t have enough extra signatures to act as a cushion for erroneous or duplicate petition signatures, which must come from registered Washington voters.