Hillary Clinton leads Bernie Sanders 49-45% in a new Massachusetts poll.

It could be that white liberals are abandoning Sanders due to the bandwagon effect. That is, as Sanders looks increasingly like the loser of the primaries in the long run, voters tend to coalesce around the one leading in every state that matters.

Nobody likes a loser. Or perhaps voters have read more about how single layer is extremely expensive and won't pass Congress anyway. 

Whatever the reason, this is great news for Clinton.

Link to poll.  www.wbur.org/...