I don't understand why liberals are upset with this video. Of course the self-proclaimed right wing terrorist in the video is your standard bigoted and uninformed nutjob, but everyone recognizes this subspecies as a group who just can't help the way they are. They need our help, not our derision. No reason to get upset over that.
And the congressman's emphatic proclamation of support for the nutjob (near the end of the video) is not in the least bit surprising by now. In fact, let everyone see this. It will just encourage more moderate Republicans to leave their increasingly fringe party. No need to get upset.