Agudath Israel of America does actually represent leading rabbis. Here’s there official statement:
http://www.cross-currents.com/archives/2012/05/09/agudath-israel-statement-on-same-sex-marriage/
Agudath Israel statement on same-sex marriage
By Avi Shafran, on May 9th, 2012
In the wake of President Obama’s sharing of his personal feeling that the millennia-old institution of marriage should be redefined in contemporary America, National Jewish Democratic Council chair Marc R. Stanley declared his admiration for the president’s demonstration of “the values of tikkun olam.”
A political group is entitled to its opinion, no less than a president is to his. But to imply that a religious value like “tikkun olam” – and by association, Judaism – is somehow implicated in a position like the one the president articulated, is outrageous, offensive and wrong.
We hereby state, clearly and without qualification, that the Torah forbids homosexual acts, and sanctions only the union of a man and a woman in matrimony.
The Orthodox Jewish constituency represented by Agudath Israel of America, as well as countless other Jews who respect the Jewish religious tradition, remain staunch in their opposition to redefining marriage.
G-d Bless Agudath Israel for taking that stand.
And thank you for sharing that information with us!