While Donald Trump has put the Republican nomination away, Hillary Clinton can't quite close the deal as Bernie Sanders upset Hillary with a 7-point win in Indiana.
Unlike Ted Cruz, Bernie Sanders isn't going away nor are his supporters at least for now.
So what happens to Bernie's supporters when their candidate doesn't get the Democratic Party nomination? I suspect the Millenials will support Hillary. Trump's racist tropes about Mexican and Muslims simply do not resonate with people under 30. But older Sanders' supporters who have faced tough economic times might not be so eager to cast their lot with Hillary and cast a protest vote for Trump.
The longer Bernie is in the race the more this will be a factor.