What does Hillary need to do tonight?
Will she win by a big enough margin in Pennsylvania to stay in the race? It’s another US primary night on PB and I hope you’ll stay with us to share your news and insights. The voting will close at 1am UK time when we should iget news of the first exit polls. The critical thing tonight will be how both camps spin it. What percentages will define success or failure? A consensus seems to be emerging that if Obama…