See MSNBC article:
Iowa gay marriage ban ruled unconstitutional
State supreme court says law violates rights of gays and lesbians

Again - disclaimer: My happiness at this decision does not mean that I believe that the government has a right to be involved in parts of one’s personal life that don’t affect parties that are not directly involved - this includes marriage.  But if marriage is to be a state sanctioned institution - then it should be open for all.