the below will guarantee that he will he will have difficulty getting the most loyal of the Democratic electorate to vote for him -
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On African-American support for Democrats
Well, here's what you got. What you got is an African-American president, and the African-American community is very, very proud that this country has overcome racism and voted for him for president. And that's kind of natural. You've got a situation where the Republican Party has been strongly anti-immigration, and you've got a Hispanic community which is looking to the Democrats for help.
But that's not important. You should not be basing your politics based on your color. What you should be basing your politics on is, how is your family doing? ... In the last election, in state after state, you had an abysmally low vote for the Democrats among white, working-class people. And I think the reason for that is that the Democrats have not made it clear that they are prepared to stand with the working-class people of this country, take on the big money interests. I think the key issue that we have to focus on, and I know people are uncomfortable about talking about it, is the role of the billionaire class in American society.
http://www.npr.org/blogs/itsallpolitics/2014/11/19/365024592/sen-bernie-sanders-on-how-democrats-lost-white-voters
White privilege allows his dismissal of the reality of a good-sized demographic in this country. But since he never was a "Democrat" but decided to run as one now, he seems to miss the dynamic.