The same-sex marriage campaign has become the most expensive ballot measure on a social issue in the nation's history.
Those in support and opposition of the California ban on same-sex marriage raised more than $83 million in campaign funds.
Elected officials, businesses, churches and individuals alone donated more than $28 million into the campaign commonly known as Proposition 8.
The Church of Jesus Christ of Latter-day Saints reported that its role in getting the initiative passed ran up a price tag of nearly $190,000.
The church has been criticized for strongly encouraging its members to support Proposition 8 for the first time.
Focus on the Family, the evangelical Christian media empire based in Colorado, also reported giving $657,000 in cash and services to promote the Yes on 8 campaign.
The Democratic State Central Committee donated $150,000 and spent another $202,647 on mailers and other kinds of contributions to have the marriage ban overturned.
Proposition 8's sponsors had sought permission to keep the identities of about 530 private donators secret. They argued that the identifying information in previous campaign reports had led to donors being harassed and some receiving death threats.
However, U.S. District Judge Morrison England decided, Thursday, to uphold a law allowing all political donations over $100 to remain public.
Yes on 8's campaign manager, Frank Shubert, was disappointed by the ruling.
"We are disappointed that we did not receive the preliminary injunction," he said. "But this fight is really about how donors to a future campaign will be treated. We are committed to ensuring that supporters of traditional marriage can do so without fear of intimidation and harassment."
ProtectMarriage.com and the National Organization for Marriage can proceed with a lawsuit seeking to have the information removed from the secretary of state's Web site.
Proposition 8 passed with 52 percent of the vote on November 4. Gay marriage backers have asked the California Supreme Court to overturn it.
Sources: ProtectMarriage.com, Associated Press