The "leading American rabbi" Yehuda Levin mentioned in this Ynet article appears to be the same Yehuda Levin who was on Pat Buchanan's staff for his presidential runs.
Levin wanted me to write an anti-abortion article for the Minnesota Jewish newspaper to publicize an anti-abortion campaign he was heading. I told him I would write an article on the halakhic views on abortion, including Rav Moshe Feinstein's. Rav Moshe was opposed to state limits on abortion because he believed there would be times when halakha would mandate an abortion to save the life of the mother, and state controls would prevent that.
Rabbi Levin was confused by that. He said abortion is assur (forbidded) in all but the most extreme circumstances, and generally showed himself to be something far less than a halakhic expert.
Levin is now on an anti-gay crusade, sparked, it seems, by Jerusalem's gay pride march. The idea that most homosexuals do not choose homosexuality, that genetics play a far more important role than "choice," escapes him.
This does not mean Torah-observant Jews should promote homosexuality. But it does mean this issue demands a level of sensitivity and understanding Rabbi Levin and his haredi cohorts wholly lack.
Rather than marching for "morality," Rabbi Levin should spend some time learning poskim.