The "B" word is also fueling new fears about the ultimate consequences of gay marriage. As Sen. Sam Brownback, R-Kan., said on the floor of the Senate: "Same-sex marriage proponents argue that sexual orientation is like race, and that opponents of same-sex marriage are therefore like bigots who oppose interracial marriage. Once same-sex marriage becomes law, that understanding is likely to be controlling." Brownback pointed to a litany of potential negative consequences for traditional faiths: "So in states with same-sex marriage, religiously affiliated schools, adoption agencies, psychological clinics, social workers, marital counselors, etc. will be forced to choose between violating their own deeply held beliefs and giving up government contracts, tax-exempt status, or even being denied the right to operate at all. ... It's already happening, as we've seen in Massachusetts with Boston's Catholic Charities being forced out of the adoption business entirely rather than violate church teaching on marriage and family."

Brownback was drawing on the conclusions of an impressive group of religious liberty scholars, brought together by the Becket Fund for Religious Liberty to consider the implications of same-sex marriage. (You can read the paper yourself at www.becketfund.org/index.php/article/494.html.)

For the foreseeable future, Americans are going to live with some deep moral disagreements on the marriage issue. Conducting this debate in a spirit of mutual respect and civility would be a lot easier if gay marriage advocates stopped pretending that only fear, hatred or bigotry is at the root of these disagreements.