In this June 9, 2015, file photo, Karman Willmer, left, and Shelby Messenger rally against SB 277, a California measure requiring schoolchildren to get vaccinated, outside the Capitol in Sacramento, Calif.
In this June 9, 2015, file photo, Karman Willmer, left, and Shelby Messenger rally against SB 277, a California measure requiring schoolchildren to get vaccinated, outside the Capitol in Sacramento, Calif. Rich Pedroncelli AP
In this June 9, 2015, file photo, Karman Willmer, left, and Shelby Messenger rally against SB 277, a California measure requiring schoolchildren to get vaccinated, outside the Capitol in Sacramento, Calif. Rich Pedroncelli AP