As a gay person, I can tell you that married couples in the USA have over 1000 benefits in taxes and social rewards that single people do not get. These same benefits are not given to Domestic Partnerships. I got married to a man because I love him with all my heart, body and soul. We also got married for the practical financial benefits that are shared by married heterosexual couples.
Do you really need to hear horror stories to understand?
How about the case of 2 men who lived together as lovers for 35 years but could not get married. When one became very ill and died, suddenly relatives came out of the woodwork and took everything that could not be traced to the survivor's ownership (sales receipts). When the partner was ill, the survivor had no right to visit him, so he died without saying goodbye to his lover of 35 years. He was also not allowed to go to the funeral held by the dead man's relatives. Because of their bigotry and hate, a 35 year relationship was made null and void. The dying man was not allowed to be comforted in the hospital by his partner, nor to say goodbye. The family even took the corpse back to the Midwest to be buried. The couple had lived 35 years in California. The dying man wanted to be cremated and have his surviving partner scatter the dust in their favorite spot along the ocean. This was ignored because the family would not give any respect to the "evil" relationship.
With marriage, none of this can happen. Heterosexual posters here can be flippant and humorous, but to gay people marriage is a GIGANTIC financial and social right that heterosexuals take for granted. There is nothing funny or flippant about it. Now, I am not going to argue with heterosexuals about how gay people do not need marriage. I don't need to read garbage like that. If YOU do not want to be married, fine. No one is forcing you. But don't you dare try and tell me that unmarried people have all the same financial rewards and rights as married people. That is a lie, plain and simple.