Some good, some bad obviously.
Certainly think a lot of themselves. Also they vote so Democratic because they're the most diverse. I doubt older minorities are less loyal to Dems, and I doubt White millennials are overly Democratic. All that is to say is that I don't think there's been a huge ideology shift from parents to kids, rather a change in who makes up the generation.
White Millennials are definitely more Democratic than the older generations, and not just by a little. In 2008, 54% of white Millennials voted Democratic, as opposed to 41% for white voters ages 30+. 13 points higher difference is pretty big. In 2012, on account of the recession and PPACA, that number dropped to roughly 44% - 45% of white Millennials voting for Obama. That's still 5 - 6 points higher than the national average. You can really take 2 things away from this:
1) The Millennial white vote floor for Democrats is a good bit higher than GenX-Silent, and
2) the ceiling for the Millennial white vote for Democrats is much higher still.
As well, Hispanic Millennials are even more Democratic than the older generations, and African American Millennials' Democratic allegiances are more or less the same.
But worth considering is that these are national averages, so certain states will not be as supportive or uniform as the rest - Especially Southern states vs. Northern states in terms of white Millennial Democratic leanings.
And finally, given current polls for 2016, it looks to be another Millennial blowout for Republicans. Sanders has higher support among Millennials on average than Obama did in 2012, and against certain candidates (Cruz and Trump), he polls as high as 68% - 72% with them. Clinton isn't too much worse, but she looks set to get 58% - 66% against most candidates. Either way, it's clear Republicans won't be even coming close to solving their youth vote issue this cycle. Bernie's campaign has seemingly shown that Obama's youth vote drop was just about Obama and not about young voters not supporting Democrats anymore.
Sources:
http://www.pewresearch.org/2008/11/13/young-voters-in-the-2008-election/http://www.civicyouth.org/wp-content/uploads/2012/11/CIRCLE_2012Election_GenderRace_ForWeb1.pdf