Gay marriage in the US: six ways states differ on the issue
Take a look at where states currently stand on gay marriage in the US.
3. Grant nearly all or some state-level spousal rights to unmarried couples (domestic partnerships)
While similar to marriage, a domestic partnership does not necessarily grant the 1,138 rights afforded to married couples in the US by the federal government, as tallied by the United States Government Accountability Office. Furthermore, domestic partnerships are determined by each state or local jurisdiction, so there is no nationwide consistency on the rights, responsibilities and benefits afforded to domestic partners.
District of Columbia