It seems the Hillary-campaign hacked the YouGov website, because they didn't like today's numbers.
I'd like these numbers if I was the Hillary campaign.
1) The Iowa result is actually pretty bad for Sanders. YouGov is consistently his best pollster and they showed him up double digits back in September.
2) He's gained nearly nothing among blacks in SC, solidifying her firewall there and countering the conventional wisdom (among Bernie supporters, that is) that they'd turn on Hillary as soon as they learned who Bernie was.
The NH numbers are bad, but I'd imagine that they've already written NH off, privately if not publicly.