As of Oct. 28, Mormons accounted for 46 percent of the total support for Proposition 8, according to the Mormon-run Web site MormonsFor8.com.

NPR: Mormons Divided On Same-Sex Marriage Issue

But eventually he decided to leave the Mormon Church entirely because of the stance it took on a proposition to make gay marriage legal in California.

NPR: Gay Mormons Grapple with Faith, Sexuality

Much of the Mormon money has been funneled into ad campaigns that observers say have been very effective in narrowing the gap between Proposition 8's passage and failure.

NPR: Mormons Divided On Same-Sex Marriage Issue