I agree there is probably a political aspect, but again it's the complain about it when it happens to your side, look the other way when it happens to theirs. Faux did this in the lead up to the election by disabling votes while CNNs down votes were inflated over news items that were deemed by me to be irrefutable. It's odd to me it was at 1/3 clip. I think it was either intentional, don't watch the clip, or both. Assuming it isn't a conspiracy I'd guess because CNN pulls in the largest viewers on the left.