When my home state of Maryland considered legalizing "same-sex marriage," as President of Marriage Savers, I testified against it and wrote a letter to legislators detailing ten reasons to oppose it: 1.
Gays are not interested in marriage. Massachusetts was the first state to adopt gay marriage in 2004. However, there've been only 12,000 same-sex unions. According to the Centers for Disease Control, 4% of men are gay and 1% of women are lesbian. Thus, of the state's 3.3 million males, there are 132,000 gay men, plus 33,000 lesbians. Only 14% of the 165,000 have "married" and 86% chose not to do so. Clearly, most are not interested in marriage.
2. Why should the definition of marriage be changed when less than a tenth of 2% of the population wants to force that change? In all 30 states that have added constitutional amendments limiting marriage to the union of one man and one woman, traditional marriage has always been upheld by referenda, even in California, which voted for Obama over McCain by 24%.