This is the current list of co-sponsoring groups as of March 3, 2012.
Pro-Life Alliance of Gays and Lesbians
Life Matters Journal
Los Angeles Catholic Worker
All Our Lives
Torture Abolition and Survivor Support Coalition
Benet Hill Monastery (Benedictine)
The Charles and Mary Crossed Foundation
Feminists Choosing Life of New York
Democrats for Life of New York
If your group is interested in co-sponsoring, see the blog post on Opportunities for groups to participate in Conference for information on how to become a co-sponsor.