The Arizona House has passed SB 10242 and sent it on to the Senate. This would put a measure to the voters to amend the Arizona Constitution to ban same-sex marriage. A similar proposal was voted down in 2006, but that measure included a provision that would have prohibited state benefits to domestic partners–this one doesn’t.
Unfortunately, I think this has a good chance of passing.
Arizona already bans same-sex marriage by statute, but not in its Constitution.