Oh, you mean what Michelle Malkin described in her 2005 book Unhinged: Exposing Liberals Gone Wild? A book whose description is mild by 2018 standards?
Well, that is kinda like it. Rush has said this off and on since the early ‘90s. When lefties are out of power, they come up with all sorts of crazy ideas, accusations etc. And act out in strange ways. It is a means of drawing attention to themselves.