One of the prejudices that figures on both the left and right of American politics seem to feel quite free to express quite openly is to be "anti-fat." Just as pundits on the right fling the "fat" epithet at Michael Moore and Al Gore pundits on the left throw around the same insults. For example Wonkette's entire argument against Chris Christie appears to be "don't listen to him, he's fat."
Chris Christie Makes Fox News Tilt Left
Remind me again why it is wrong for "the right" to do this but not the left. Remind me again why it is wrong to discount someone's opinions on the basis of the colour of their skin but not on the basis of how much they weigh.