The Unitarian Universalist Legislative Ministry California has taken a position against Proposition 14, the top-two ballot measure on the June 8, 2010 ballot. See here. The UULMC represents the 80 Unitarian congregations in California, and is headquartered in Sacramento. Thanks to Cat Woods for the link.
While I am not a Unitarian, I am pleased to see what they have taken this stance, hopefully it was done in the name of protecting political rights.