I'd call that an ouch for Trump.
Sanders supporters are still coming to terms w/ Hillary as the candidate. They'll come back to the Dem party in droves come fall.
The polls are surprisingly close right now, but once Sanders supporters come around, Hillary should get to the double-digits.
I wouldn't bet the ranch on that. The kids will do it for spite and Trump speaks to them (jobs). The hippies hate hrc more than anyone.