welcome to the Democratic fracture
Sanders does exceptionally well in states where independents can vote. He won Rhode Island. Also, as evidenced by Maryland's primary Bernie won voters under 30--in fact he crushed her among this age group by about 73%.
Those who have no trust in the present "establishment" Democratic Party coupled with young voters who have little or no history with the Democratic Party and their agent, hillary clinton are those who vote for bernie--I love it,,,,,,"agent".
Read this carefully...there are NO alternatives or secondary candidates who will adequately replace Sanders and what he represents. Hillary is out of luck with independents.
Many in the Democratic Party are going to wake up in a month or two and realize that their candidate is the target of a criminal investigation and awaits a similar fate to that of Richard Nixon.
But it'll be too late.