Worth pointing out that progressives & people of color are also on the list in the actual article, with an eye towards potential coalition-building.
Although Biden publicly floated the idea of a GOP VP cuz he’s naive enough to think he can build a coalition with them. 
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Sanders HAS built a coalition. But the problem is, young people are a major part of that coalition, and they haven’t been turning out in these primaries.
End of conversation
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Bernie has managed to build a fairly large coalition in a different party. That doesn't count, though, despite the fact that it's the only thing that's supposed to count. Whenever they say "can't build a coalition," I hear "a coalition of people that actually matter"
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