1st time voters qA about 41%, somewhat better than DMR poll, but perhaps not good enough for Bernie.
But then there are these:
58% female, which breaks 55-40 for Clinton. .58 x .55 = .319
42% male, which breaks 47-43 for Sanders. .42 x .43 = ,181
That rounds to just about 50%
36% over 65, and it breaks 63-29 Hillary. .36 X .63 = .227
36% is 45-64 and it breaks 57-34 Clinton. .36 x .57 + .205
Some evidence that later info from entrance polls is a bit more favorable to Sanders — as of 8:30 44% were 1st time caucus goers. But that is still below what occurred in 2008 (57% according to Steve Kornacki) or even 2004 (over 50%).
One more thing to remember — in 2008 caucus was on Jan 3, with many college students were home with families, which means their vote was not as concentrated on college campuses.
Make of it what you will.