Bernie Sanders is doing better with black voters — but it’s still not good enough

Math — and specifically, delegate math — has not been Bernie Sanders’s friend in the Democratic presidential primary. And that remains the case — even as he showed some continued improvement Tuesday on one particular statistic: his performance with black voters.

Hillary Clinton took Ohio and Florida Tuesday night, the two largest delegate prizes in primaries scheduled this week. She later claimed victory in North Carolina and Illinois. Together, those outcomes give Clinton a more than 300-delegate lead over Sanders — not including superdelegates — making it quite difficult, if not impossible, for Sanders to catch up or surpass Clinton before the Democratic National Convention.