FILE - In this Thursday, Nov. 7, 2013 file photo, Karen England, executive director of the California Resource Institute, left, and volunteers Grace LeFever, center, and Christina Hill, sort through stacks of mail with petitions for a referendum to overturn a new California law that allows transgender students to chose which public school restrooms they use, in Sacramento, Calif. Opponents of the law are working to collect the 504,760 signatures needed to place the referendum on the November 2014 ballot. If approved by voters, the referendum would overturn the law, approved by state lawmakers, that allows transgender students the choice of which restrooms they could use, but also whether to play boys or girls sports. (AP Photo/Rich Pedroncelli, File)

Photo by: Rich Pedroncelli

FILE - In this Thursday, Nov. 7, 2013 file photo, Karen England, executive director of the California Resource Institute, left, and volunteers Grace LeFever, center, and Christina Hill, sort through stacks of mail with petitions for a referendum to overturn a new California law that allows transgender students to chose which public school restrooms they use, in Sacramento, Calif. Opponents of the law are working to collect the 504,760 signatures needed to place the referendum on the November 2014 ballot. If approved by voters, the referendum would overturn the law, approved by state lawmakers, that allows transgender students the choice of which restrooms they could use, but also whether to play boys or girls sports. (AP Photo/Rich Pedroncelli, File)