A simple statistic from Nate Silver:
Among states where exit polls have been conducted, Sanders has won independents in all states but Alabama, Georgia and Mississippi. However, Clinton has won Democrats in all states but Vermont and New Hampshire (she also tied Sanders among Democrats in Wisconsin). Overall, in the average state where exit polls have been conducted, Sanders has won independents by 27 percentage points while Clinton has won Democrats by 29 percentage points.
(Emphasis mine.) This has been going on all primary season, and somehow it hasn’t been a big point of discussion. But really, while I’m all for everyone getting their chance to vote…
...if you’re trying to be the Democratic nominee, I don’t think it’s unreasonable to ask that you win among Democrats.
That’s all I wanted to say about that.