See, this is why I made a thread about understanding the process and DNC vs. state party organizations. Tom Perez had nothing to do with last night.
Do I need to re-up my thread about how there isn't actually such an organization as The Democratic Party or The Republican Party?
Tom Perez didn't decide that Iowa should have a caucus. Tom Perez didn't run the caucus. If Tom Perez had said two words about how Iowa should have run the caucus, I am confident the Sanders campaign would have quite rightly called foul about DNC interference.