Looks like Argentina is more progressive that the United States

This week, the Argentine Congress ruled it unconstitutional to refuse marriage rights to a couple of the same-sex

"La Justicia le dio el sí al matrimonio gay: en un fallo iné-dito, una jueza declaró inconstitucional el impedimento para que dos personas del mismo sexo puedan casarse y ordenó al Registro Civil porteño que celebre la unión de la pareja homosexual que inició la demanda. La sentencia es de primera instancia y previsiblemente será apelada por el gobierno de Mauricio Macri. No obstante, crea un precedente que excede el ámbito judicial y brinda un espaldarazo insoslayable a la campaña para instaurar esa figura en el país en un momento donde un proyecto en ese sentido se debate en la Cámara de Diputados."

"The Justice gave a yes to gay marriage: in an unprecedented decision, a judge declared it unconstitutional to impede two people of the same sex to be able to get married and ordered the Registro Civil porteño to celebrate the union of the homosexual couple who initiated the lawsuit. The ruling is the first instant and it is foreseeable that there will be a fight by the government of Mauricio Macri. Nevertheless, it creates a precedent that surpasses the judicial field and supports an unavoidable recognition to the campaign for founding this image in the country in a moment where a project with this meaning is debated in the Cámara de Diputados"

I didn't do the best translation possible but you get the idea
There is not yet a law that allows gay marriage but it has been declared unconstitutional to deny the right to marry for same-sex couples
YEEEEE
Get on board United States!

UPDATE: The mayor declared that he is not going to fight this ruling