Democratic presidential candidate Hillary Clinton, right, smiles next to Oakland Mayor Libby Schaaf at Clinton's campaign field office in Oakland, Calif., Friday, May 6, 2016.
Democratic presidential candidate Hillary Clinton, right, smiles next to Oakland Mayor Libby Schaaf at Clinton's campaign field office in Oakland, Calif., Friday, May 6, 2016. Jeff Chiu AP
Democratic presidential candidate Hillary Clinton, right, smiles next to Oakland Mayor Libby Schaaf at Clinton's campaign field office in Oakland, Calif., Friday, May 6, 2016. Jeff Chiu AP