I thought this explanation for the (usual) slimey insults from Kossite emailers was interesting:

Subject: Why the name calling?
It’s not because you’re insulting “The One.” It’s because you’re insulting us. All two and a half million of us who have donated to the Obama campaign. You’re calling us all cheats and liars. When you do that to a large group of people, you can expect a reaction. My reaction was to donate another $100 to the Obama campaign and another $50 to the DNC.
You’re welcome.

Me: Well, it’s an explanation, I guess. I think it’s a weird and vaguely creepy one, but it is an explanation. So thanks.