"We are an American political party, uniquely formed as a true, constitutional movement, reaching out to all who seek a secular government as outlined in the First Amendment to our United States Constitution. Our mission: To politically represent U.S. atheists and all who are drawn to our mandate, in a political process that has thus far marginalized and ignored one of the largest and growing segments of the U.S. population."  http://www.usanap.org/

This will be something to keep an eye on.  Lots of people are fed up with the two-party political system and looking for something that matches their beliefs.  There is a facebook page for the California chapter for more information.