Because their leader Nancy the shrew:
https://pbs.twimg.com/media/C5zxvh9WYAAT_jl.jpg
(still maintains the queen of ugliness in looks, behavior and approach to the job)
set the example.
When we see THINGS like this and Harry Reid and the recently defeated Clinton, it just begs the question that must haunt the democrats.....why can't we do better than this?