Wall St Journal reports: The Yes on 8 campaign has received "more proportionally from the Latter-day Saints Church than from any other faith," said Mr. Schubert, 35% to 40% of the total. The Mormon Church encouraged its members to send their donations to a separate post-office box set up by a church member, said Messrs. Schubert and L. Whitney Clayton, a senior Mormon Church official involved in the campaign. Mr. Clayton said the church didn't keep track of how much individual Mormons donated, just the cumulative total. He said members bundled the donations and forwarded them to the campaign.
[Mormons for Marriage: A Prop 8 Timeline, http://mormonsformarriage.com/?page_id=68]