The dire warnings about a Donald Trump presidency. Through protests and jeers, a small-but-vocal group of Bernie Sanders supporters have made clear they will never back Clinton for president. Sanders has been steadfast in his views for decades, calling himself a democratic socialist, denouncing the disparity in wealth in America, and opposing trade deals. Clinton benefited from the overwhelming support of "superdelegates" — party leaders and elected officials who can vote for anyone they choose. [...] Sanders supporters believe he lost votes because of rules that allow only registered Democrats to vote in many state contests. [...] Sanders supporters were convinced that the officially neutral Democratic National Committee actually favored Clinton. [...] she has no realistic shot of being elected, so that's similar to not voting at all — which is another option. Some wonder how history might have been changed if votes cast for Green Party candidate Ralph Nader had instead gone to Gore.