The transcripts for the trial are now online. Brian Moulton looks over the documents:

Perhaps the most interesting evidence presented so far were documents that detailed the coordination involved between the Catholic and Mormon churches and the Yes on 8 campaign. A letter from the Yes side’s leader thanked the Catholics for their “unusual” support and the Mormons for their “financial, organizational, and managerial contributions.” The Courage Campaign quotes a document between the Yes campaign and the LDS church as saying, the church will “… not to take the lead so as to provide plausible deniability or respectable distance so as not to show that church is directly involved.”

"Plausible deniability". In other words, Prop 8 was a front organization for religious groups to strip others of their civil rights on doctrinal grounds. And it was governed by a Big Lie, which is odd for a church to endorse, don't you think?