@Jeruba Since you seem to disagree with my opinion that, if it truly is derogatory, it’s pretty damn mild compared to others I have heard, we will just let that drop.
I think your real issue here is one of class, and while your original question states that you have a similar opinion about people refer to our president as Hussein, it really begs the question of why you chose a mild example targeting a Republican as opposed to egregious examples targeting non-Republicans. Whether you are biased or not, your choice of targeting the Mittens moniker gives the impression of a double standard.
As the nation is highly polarized, ad hominem attacks are increasingly common anyways, and they have always been common in politics, so I still fail to see how it’s really a big deal. Now, if it were common to call him Shit Romney, then I would see your point, but Mittens? Really?
Just my opinion. When you disagree, please do so with class… and preferably without the sarcasm you used above, as that isn’t classy either, which makes it hard to hold any sort of moral high ground.