Ed Schultz. Michael Moore. The Huffington Post. Shaun King of New York Daily News. Prominent Bernie Sanders backers in the media and culture have for some time been perpetuating the reprehensible idea that black voters - who delivered 30, 40, 50 point wins for Hillary Clinton in southern states don't count because their states are likely to vote for the Republican in the general election in November.

But it isn't just his prominent supporters. The Sanders campaign has itself repeated that message, albeit in more subtle forms. After Hillary Clinton won seven out of 11 states on March 1, Sanders senior adviser Tad Devine and campaign manager Jeff Weaver sent the message that the "calendar" ahead didn't look good for Clinton, intimating that the black-heavy southern states where Clinton racked up big margins were about done voting (well, that prediction didn't work out too well).

It was only a matter of time before a prominent Sanders backing organization would do something like this: