I would also say that he succeeds...where many in the left fail...because he presents himself unashamedly, aggressively, as a working class slob: he's overweight, he wears one of those silly baseball caps, he is never fashionable. He never makes the working class feel ashamed of themselves...something that leftists often inadvertantly do by portraying the ideal life that the working class can achieve when they have thrown off their oppressors. At any rate, I have noticed that the socialist "idealization" of the future (aside from producing very good jokes) can have the indirect effect of making working people ashamed of their present.
Joanna