I dissected this one today! Now keep in mind politics is a game and I think this one is a Republican play of mastery. Now bear with me
I don't know if the first few gay marriages were plants or if this phenom just happened. Regardless the republicans saw an opportunity to divide the dems and squash a growing unity in the party. By making this a forefront isssue they have forced Kerry to denounce gay marriage and double talk the issue. This has pissed off alot of gays and their supporters. It may also push hardcores to Nader(is he pro gay marriage? I honestly don't know) and or keep them home on election day. Those in favor were never going to vote Bush anyway so no harm done there. Also the ammendment will never pass so, again much adu about nothing. In the end no one wins but the dems lose. Kind of a cute little plan I say.
FWIW I don't care if gays get married, but I think they should lobby for law change within their states not break current laws.