Having survived a barrage of advertising from the 'Yes on 8' campaign quite preoccupied with setting forth the idea of saving the sanctity of traditional marriage, it seems like a good moment to reflect on what 'traditional marriage' means. The answer is: It depends a whole lot on where you sit and which tradition one chooses to reference.
It is particularly amusing that the Latter Day Saints (Mormons) have been so heavily involved in this campaign. The question to the Mormons might be what 'traditional' marriage looks like. Would that be one woman, two, three, or more for each man? Depends a lot on which Mormons you might be talking to. That's a whole lot of Big Love to pull off.
Historically (and thus perhaps most traditionally) in most of Western history, marriage is about bringing the business/resources of two families together. The wife had many fewer rights than the husband, and was expected to be subservient to him. Marriage was substantially an economic arrangement in which there was little room for love, and even affection was not considered particularly essential. Maybe that is the traditional marriage evangelical Christians seem determined to assert into all of our private lives.
In ancient Sparta, sexual relationships between men were encouraged. At the same time, Sparta insisted that men married and produced children. This seems to lend support for a traditional marriage which includes having sex on the down-low.
Early in Roman history, men had considerable power over their wife and children, whom he could punish, sell, and even kill as he saw fit. A rather drastic interpretation of traditional marriage. In later Imperial times, husband and wife approached marriage as equals, yet there was a concomitant decline in birth rates. Hmmmmm. In addition, there was a form of marriage in the Roman era that involved no ceremony but was established by the couple living together for one year. The Romans also tolerated prostitution and concubinage, and had no qualms about male-male relationships.
In ancient Israel, women were considered the property of their fathers or husbands and could do nothing without their consent. Single men and women were despised, but a man could have several wives or concubines. Solomon is said to have had 700 wives and 300 concubines, which frankly makes my head swirl. Divorce was permitted if a man found some "uncleanness" in his wife, and consisted of writing her a bill of divorce and sending her out of his house (Deuteronomy 24:1). Later, there was the levirate, or the obligation of a man to marry his brother's widow.
In early Germanic law, marriage was essentially a business deal between the between the groom and the bride's father. The symbol of a successful 'bride sale' was the ring, which was given to the bride. The payment of the the 'bride price' was made on delivery (i.e., the wedding). Women were largely treated as domestic slaves. Keeping women as concubines was acceptable.
In early Christian Europe evolved the idea of marriage as coming from the free consent of two partners. It thus became possible for couples to get married secretly if they could not gain anyone else's approval. It also became possible for very young children to get married, if their parents could coax the necessary consent out of them. This was particularly popular in cases in which a politically advantageous match was found for their young sons or daughters.
In the 17th century, English Puritans passed an act of parliament asserting "marriage to be no sacrament" and soon thereafter made marriage purely secular. It was no longer to be performed by a minister, but by a justice of the peace. The law was abolished by the Reformation, but the Puritans brought it with them to America.
Martin Luther condoned polygyny in 'exceptional' cases. For example, he permitted Philip of Hesse to take two wives. Of particular note is that Protestant churches do not view marriage as a sacrament, as do the Catholic and Orthodox churches (post 12th century). This break was part of Protestant effort of purification of the church from practices/rituals thought to be departures from the Bible.
In America, the Oneida Colony (an offshoot of Quakerism), established in upstate New York in 1848, cultivated a form of group marriage called "complex marriage" in which theoretically every woman was married to every man. Exclusive attachments between people were considered selfish and idolatrous, a particularly intriguing take on traditional marriage. The community also practiced "scientific breeding" in which potential parents were matched by committee for physical and mental health.
Marriage in the US was still largely an economic arrangement well into the 19th (and 20th) century. Husbands controlled the wife's property, and had many other rights denied his wife. He was also favored (and to some extent still is) by a moral double standard that offered the male considerable sexual license.
This is just an idea of how marriage has evolved, and continues to evolve, in Western society. In addition, there are a vast array of 'traditional' notions of marriage around the world. When one speaks of traditional marriage, it is unclear what one means, particularly in a multicultural society. Even Christian notions of marriage have changed considerably in just the past century. The concept of marriage as the union of two people who love one another is actually quite recent. Marriage continues to evolve, as does our relationship to it, as our society and concepts of family also evolve. The archetype of a family consisting of the union of a man and woman as a prerequisite for raising children is not fully reflective of our culture. Among the many permutations of families, there are single women raising children, single men raising children, male and female same-sex couples raising children, couples of all persuasions without children, and people choosing their families rather than having families wholly defined for them by birth.
The possibility for how one chooses to define the union of two persons in the context of our culture should be as available to them as are the possibilities for defining relationships and families. It is not about tradition, but an institution struggling to keep up with cultural context.