Bernie Sanders won a convincing victory 51.4% to 36.0% over Hillary Clinton in the West Virginia primary. The 15-point margin of victory was well above what the poll averages predicted. This follows his victory in Indiana last week.
This must be worrisome for Clinton and her supporters. It is true that she still has a commanding lead among delegates especially when superdelegates are factored in, but the fact that she cannot put away this race has to be embarrassing for her. Next week sees Kentucky and Oregon. Polling is next to non-existent in those states so it is hard to gauge sentiment. But there is no reason to think that they will be easy for her.
She has to be hoping for a strong finish to the primary season in delegate-rich New Jersey and California on June 7 if she wants to avoid limping into the Democratic convention with the aura of a loser.