From Seth Abramson at The Huffington Post / 03.31.2016:
On February 27th, Hillary Clinton led Bernie Sanders among African-American voters by 52 points.
By March 26th, she led Sanders among African-Americans by just nine points.
And today, Public Policy Polling, a widely respected polling organization, released a poll showing that Sanders leads Clinton among African-American voters in Wisconsin by 11 points.
It’s all part of a dramatic national trend that has seen Clinton’s support among nonwhite voters dwindle to well under a third of what it was just a month ago — not nearly enough support to carry her, as it did throughout the Deep South, to future electoral victories in the Midwest and Northeast.
So no, it’s not a coincidence that, in the 18 state primary elections since March 1st, Bernie Sanders has won on Election Day in 12 of them.