You are right, Jim, mostly  young white men.  As Rampell notes, Millennials.  There they were, marching in a long torchlight parade through the U Virginia campus.  Remind you of something scary from history?  It should.  
History has  shown that the young, politically, tend to be more radical, more open to extremes, than older voters; more emotional and idealistic but in a black and white sense.  
They also tend to be more liberal, as we saw in the tumultuous 60's.
But what about situations where the young, including students, were more conservative than their elders?  It's uncommon, but a stark example was Nazi Germany.  Those torchlight parades often included book burnings as well as attacks on Jews and liberal professors.  
Looking at the makeup of the German Reichstag  in 1933 we see the majority  of the Nazi deputies were under 40, while the majority of the Socialists were over 50.
Now look at the  age of the leadership of today's Democratic party....