Internals are a disaster for Clinton (too few blacks, 1/3 blacks going for Trump, Trump winning 18-34 year olds)... and Trump still leads by only 4. NC is clearly in play.
Romney won 37% of the 18-29 vote in 2012. And, Obama was a much better fit for young voters than Hillary. I'm not particularly surprised that polls have young voters close this time- I think Rubio would have actually won 55%+ of the millennial vote.
I doubt that, I don't think Millennials as a whole appreciate many stances the Republican Party has taken from LGBT rights to economic policy.