Humor versus Seriousness as Political Persuasion




So why is it that humor is the favored mode of communication among liberal public voices and sternness is the tone of most conservatives? Why has each side turned to such different means of persuasion? I guess the fact that right now the US is pretty evenly made up of liberals and conservatives proves that neither side has a lock on persuasion. Of course good political humor is serious commentary, so I think the dudes on the left have it all right, but why does the stone cold rhetoric of the conservatives work on so many of my fellow Americans?
I haven't yet mentioned the fact that these prominent public voices are all straight (I presume) white guys, but that is a subject for another blog . . .