Presbyterians for Gay and Lesbian Concerns
http://www.epp.cmu.edu/~riley/PLGC.html
This group, founded more than 20 years ago, has branches in most major American cities. It is also a strong supporter of the "More Light" movement within the PCUSA (Presbyterian Church in the U.S.A.) denomination, a network of GLB inclusive congregations seeking to overturn the denominational ban on the ordination of GLB clergy.