...even though they are far left.
Plus, it's not accurate to say that all 48% of the Kerry voters were ultra-liberal the way Boxer is. Many are not that liberal, but just had certain reasons for not liking Bush. Neither are all the Bush voters ultra-conservative.
dazzleman is right about Democrat voters - very few are 'far left'. Certainly the party itself is a Center-Right party. As for Bush voters, while not all are ultra-conservative, I think a far larger proportion are 'extremists' than Kerry voters.
Kerry was an extremely moderate candidate.
