A campaign finance disclosure bill is being approved by the California Legislature and now heads to the governor's desk.  

Senate Bill 27 requires organizations that contribute to political campaigns to reveal the identities of their donors if they spend more than $50,000 in a year or more than $100,000 in four straight years.  

Proponents say this legislation would close a loophole that allows such donors to hide by funneling money through nonprofits.  

The bill comes in response to an Arizona nonprofit that anonymously spent millions to defeat California propositions in 2012.