Of course, they have not always stood by her. In the 2008 South Carolina primary, black voters in large numbers abandoned the Clintons and gave their ballots and adoration to Mr. Obama. This provoked Bill Clinton to famously lose his cool and say some things about Mr. Obama that he quickly regretted. No permanent damage was done, however. When Democrats cast their votes in Saturday's South Carolina primary, Hillary is expected to easily beat Mr. Sanders, thanks to the renewed allegiance of black Democrats.