The decision that said denying marriage rights to same-sex couples was unanimous. Now, 3 of those 7 justices will have to be replaced. Much like the situation with Prop 8, most of the money for the campaign came from out-of-state groups who can't stand to see equality grow anywhere including the fear mongers from National Organization for Marriage.
http://news.yahoo.com/s/ap/20101104/ap_on_re_us/us_iowa_court_gay_marriage_4