First a little background on civil unions and same-sex marriage:
Marriage for all is preferable to civil unions only for some. Firstly, it is not equal to allow heterosexual couples the benefits of marriage, while same-sex couples enjoy only a fraction of the rights, as dictated by their respective states. Marriage affords to its couples many federal protections that states’ civil unions are incapable of providing, in the areas of taxation, Social Security benefits, Workmen’s Comp benefits and family and medical leave protections, among others. Marriage in general also offers the right of an individual to visit an ill or injured spouse; something that is truly heartbreaking to those who cannot partake of it.
Comment: And of course, I hope it goes without saying that equality for all people is at the core of support of same-sex marriage. The fact that I didn’t include men I hope is obvious, as I was trying to make an argument on behalf of equality in marriage for women.