He only had 18 bound delegates. That means 2 of the 3 superdelegates also voted for him, which gives an indication he had a lot more support. You can thank Rick Perry for making sure the binding rules were followed.
Has video in original post changed? I was looking for the USA vs SEAT THEM NOW chanting after Maine was unseated, but it doesn't seem to be at 2:30:00. I thought I watched it yesterday in the vid but maybe I saw it elsewhere.