After President Obama announced his support for same-sex marriage, a group organizing a fundraiser on his behalf suddenly had to find a bigger venue. The event, featuring the pop singer Pink, is one of two LGBT-organized fundraisers Obama is expected to attend on the West Coast on Wednesday.

A CNN analysis of President Obama’s biggest fundraisers, known as bundlers, shows that at least 33 — or about one in every 16 bundlers — is openly gay. Together, they have raised at least $8 million for the campaign between January and the end of March.

By contrast, in the same period, bundlers from the television, movie and music industry, some of whom attended a recent high-profile fundraiser hosted by actor George Clooney, raised $6.8 million, according to the Center for Responsive Politics.

While campaign finance laws require donors to disclose their full names, addresses, occupations and employers, there is no box to check for sexual orientation. Nor does the law require candidates to release information about their bundlers. Under prodding from watchdog groups, presidential campaigns have released bundler data in past elections. Obama’s campaign has released its list. Republican candidate Mitt Romney’s campaign has not.

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