Joe Conason has it:
As Biden showed quite convincingly when he spoke about his modest background and his continuing connection with Main Street, perceptive, intelligent discourse is in no way identical with elitism. Palin's phony populism is as insulting to working- and middle-class Americans as it is to American women. Why are basic diction and intellectual coherence presumed to be out of reach for "real people"?
His full article is here.