There's nothing like a touch of real-world experience to inject some reason into the inflammatory national debate over gay marriages. Take Massachusetts, where the state's highest court held in late 2003 that under the State Constitution, same-sex couples have a right to marry. The State Legislature moved to undo that decision last year by approving a proposed constitutional amendment to ban gay marriages and create civil unions as an alternative. But this year, when precisely the same measure came up for a required second vote, it was defeated by a thumping margin of 157 to 39.

The main reason for the flip-flop is that some 6,600 same-sex couples have married over the past year with nary a sign of adverse effects. The sanctity of heterosexual marriages has not been destroyed. Public morals have not gone into a tailspin. Legislators who supported gay marriage in last year's vote have been re-elected. Gay couples, many of whom had been living together monogamously for years, have rejoiced at official recognition of their commitment.

As a Republican leader explained in justifying his vote switch: "Gay marriage has begun, and life has not changed for the citizens of the commonwealth, with the exception of those who can now marry who could not before." A Democrat attributed his change of heart to the beneficial effects he saw "when I looked in the eyes of the children living with these couples." Gay marriage, it turned out, is good for family values.

Some legislators who strongly oppose gay marriages also switched their votes this year for tactical reasons. They realized that the original measure was headed for defeat, and they had never really liked the part that created civil unions anyway. They are now pinning their hopes on an even harsher proposal, endorsed by Gov. Mitt Romney, that would ban gay marriages without allowing civil unions.