Caring about things like the president's choice of mustard is one of many reasons why no one takes the wingnut right seriously anymore.
TBogg mentioned the stupid arugula thing from last year. I also recall Malkin doing a pee-pee dance over the fact that the president used America-hating gherkin pickles in his tuna salad recipe.
I have a very simple response to the efficacy of these attacks: North Carolina, Virginia, Florida, Indiana (Indiana!), Ohio, Colorado, Nevada, New Mexico and Iowa.