Prominent South Carolina "Firewall" Democrat Drops Clinton Endorsement to Back Sanders

Overwhelming support from black voters is said to be Hillary Clinton's "firewall" against the possibility of Bernie Sanders victories in Iowa and New Hampshire. It's the reason that she's likely to build a delegate lead by winning primaries across the South in late February and early March. As Slate's Jamelle Bouie wrote last week, Clinton's advantage in this area has been built through decades of appearances and face-to-face conversations with voters and influential figures at "black civic and community organizations, from church networks to civil rights groups."
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