Theory on Iowa. Bernie folks took tallies in every precinct. Lawyers sent to DNC. Bernie is negotiating early payday. It's tricky though, Bernie's people know the right numbers and could revolt if Bernie allows the DNC to print fake numbers. So they can't massage as much as they want without arousing suspicion. They best the DNC can do is what is happening and delay for a momentum play at this point. The early payday danger for Bernie is that they could out him as selling out his people later on in the process.
Couple of them are decent aggregators. Good for catching up if you have been gone for a few days.