The link below is from a discussion in the State of  Indiana House Judiciary Committee on defense of marriage. It is an excellent scientific, psychological, and legal defense of traditional marriage.  It is professional, it does not insult those of different opinions, and gives a clear explanation of what those in favor of keeping the traditional marriage definition see as the dangers of altering the definition. I encourage everyone to view this carefully, even if – perhaps especially if – you are not in agreement with the traditional definition of marriage or are not sure. The link is to the blog of the Catholic Apologist Matt Fradd.

An excellent Defense of Traditional Marriage