Democratic U.S. presidential candidate Hillary Clinton speaks to supporters during her California primary night rally held in the Brooklyn borough of New York, U.S., June 7, 2016. REUTERS/Shannon Stapleton
WASHINGTON (Reuters) - Winning over Bernie Sanders supporters who flocked to his insurgent presidential campaign will be the first and possibly toughest order of business for Hillary Clinton after she became the presumptive Democratic presidential nominee this week.
Every time the Vermont senator mentioned Clinton's name at a rally in California on Thursday night, his supporters booed as if she was Donald Trump, the Republican businessman who will face off against Clinton in the Nov. 8 election.
