Washington Families Standing Together has lost its challenge to the recently approved Referendum 71:
"An appeal was considered likely, however, with just a few days
remaining before officials need to begin printing materials for the
Nov. 3 general election. The case involves Referendum 71, which
would put the Legislature's latest expansion of domestic partnership
rights for gay couples on the November ballot. The measure,
sponsored by a conservative political group called Protect Marriage
Washington, would ask voters to approve or reject the 'everything but
marriage' domestic partnership law that state lawmakers passed earlier
this year. The lawsuit seeking to halt the vote was filed by
Washington Families Standing Together, a gay-rights group. It claims
Secretary of State Sam Reed improperly accepted thousands of petition
signatures that supported putting R-71 on the ballot. Thurston County Superior Court Judge Thomas McPhee rejected those arguments."
UPDATE: There's one possible last-ditch challenge, but it looks mighty iffy.