All of the kiddos who aren't tribal are likely too young to vote
Probably why Bernie is loosing as well
A lot of "Millennials" are becoming/have been adults now. However, even if every single like minded millennial votes, its still not enough to overcome the opposites. This Election is a mess because this country still has a majority of people who firmly believe that white people can do no harm, christianity is the end all be all religion and if you go against it you do not deserve to live, and generally trying to keep outdated social views alive.
Bernie is partially losing because he isn't cutthroat enough. Hate to say it, but if he was a bit more of an starfish and a tad bit more manipulative he would blow Hillary out of the water. Also it doesn't help him when most of the voters think socialism=bad even though a ton of other first world countries are democratic socialist and strive very well from it.