Gay marriage proponents in California are following through on their pledge to publicize large donors and boycott businesses supporting Proposition 8, the ballot initiative that would make gay marriage in the State illegal once more.

Californians Against Hate first called for the boycott of Doug Manchester's two San Diego hotels, the Manchester Grand Hyatt and the Grand Del Mar, and his McCall, Idaho resort, the Whitetail Club, after the hotelier donated $125,000 to support the gay marriage ban.

Manchester has said publicly that the boycott was having no effect on his businesses, that he supported gay workers and welcomed gays and lesbians at his hotels. But a top company official fretted that the boycott could cost millions of dollars in lost business, reports The San Diego Union-Tribune.

“This boycott effort will cost you millions of dollars of lost revenue and possibly tens of millions of dollars in lost value for both the Manchester Grand Hyatt and The Grand Del Mar,” wrote Paul Wilkins, chief financial officer for the hotel group, in an email to Manchester. “Nearly every other luxury hotel in California is actively seeking out and marketing to the gay community to get their business ... We should be doing the same.”

On Thursday, the group launched a website and a call-in campaign against San Diego businessman Terry Caster, owner of A-1 Self Storage.

“This guy must really not like same-sex marriage,” said Fred Karger, Campaign Manager of Californians Against Hate in a The Huffington Post blog post. “Mr. Caster and many of his eight sons and daughters and their spouses have given a combined total of $293,000 to the Protect Marriage campaign between January and July of 2008.”

That makes the Caster family's combined contribution the largest from San Diego County.

Christian fundamentalist leaders have issued boycotts against American businesses they deemed too gay friendly, with mixed results. The American Family Association (AFA) is currently boycotting McDonald's over claims they support the “gay agenda.” However, the hamburger chain has recently posted improved sales figures. And a two-year boycott against Ford Motor Company for advertising in the gay media ended when the automaker stopped running all niche advertising as the economy soured.

“More and more business leaders are adopting policies, and creating work places, that put a welcome mat out for the LGBT [lesbian, gay, bisexual and transgender] community,” said Steve Ralls, director of communications for Parents, Families and Friends of Lesbians and Gays (PFLAG).

Backers of the “Call Terry Caster” campaign also published the top ten gay marriage ban donors. The list, labeled the “dishonor roll,” includes: The Knights of Columbus, National Organization for Marriage, John Templeton Foundation President John Templeton, Fieldstead & Company, American Family Association, Elsa Prince, Focus on the Family, the Terry Caster family, Dorothy Nielson, and Doug Manchester.

“These people are pouring in money into California to eliminate our freedom to marry, like we've never seen before,” said Karger. “They want to bully us and crush us and end any possibility of same sex couples having the freedom to marry throughout the United States. They are willing to spend tens of millions of dollars to do just that.”

The group says $10 million is being poured into the anti-gay measure each month.