Your claim is actually false here Mr. Porter. Sanders rhetoric has seduced many Democrats because people like to be told what they want to hear and this is Sanders' primary talent. You can insinuate that African-Americans, who largely support Clinton, are a bunch of right-wing Democrats but like other Democrats who support Clinton they are simply pragmatic and rightly view Sanders' lofty promises with deep skepticism. 
Young people's support for Sanders is a no-brainer. Most of these kids are almost entirely unaware both of the last 35 years of history and how the political system actually works. Plus they're getting screwed. The current disenchantment among independents (older whites) with the Democratic party is symptomatic of demographic shifts in the United States. The question is will this same group continue to be politically useful to the far-Right? The choice is theirs. Demonizing Clinton performs the same function that demonizing Obama has. Sexism replaces racism--and it works