washington california governor jerry brown tuesday endorse hillary clinton 2016 democratic presidential nomination say way keep republican donald trump white house decide cast vote hillary clinton believe path forward win presidency stop dangerous candidacy donald trump brown say letter california democrats independents post online brown popular democrat steer nation populous state centrist path praise clinton rival u.s. senator bernie sanders vermont note million vote hundreds delegate word clinton lead insurmountable democrats show millions vote want nominee california big prize six state hold presidential nominate contest june 475 delegate clinton secure 2,310 delegate 73 short number need clinch party nomination nov. election note letter brown wag populist presidential campaign 1992 lose then-arkansas governor bill clinton theme similar many espouse sanders self-described democratic socialist run slogan people brown rail influence money washington say politicians buy pay for brown say democrats need stop fight focus beat trump say present danger immigrants environment world peace stake high country face existential threat climate change spread nuclear weapons new cold war horizon brown write hillary clinton long experience especially secretary state firm grasp issue prepare lead country day one california governor endorse clinton call trump dangerous