Herb Silverman, founder and president emeritus of the Secular Coalition for America, a widely-known atheist advocacy group, recently commended proponents of same-sex marriage for their efforts in promoting their cause, and suggested atheists take a similar approach to be more accepted by American society.
MORE: http://www.christianpost.com/news/atheist-leader-suggests-nonbelievers-follow-agenda-of-pro-gay-marriage-advocates-93276/
See also...
What atheists can learn from the gay rights movement
http://www.washingtonpost.com/national/on-faith/what-atheists-can-learn-from-the-gay-rights-movement/2013/04/03/4c111484-9c11-11e2-9a79-eb5280c81c63_story.html?wprss=rss_on-faith