I think to appear to be "fair and balanced," they keep a few lefties on board to be assassinated daily on the air. Colmes and Bob Beckel come to mind.
As much as I hate Beckel, he can somewhat hold his own. Colmes on the other hand, is a complete wimp who doesn't even put forth a reasonable argument. I put Juan Williams into much the same category. He's not that smart, and his "arguments" prove it. He is simply pi$$ poor at what he does. Fox hired him because they felt bad he got canned from NPR because of what he said on Fox. It's doubtful he would have been picked up by any other station for regular work. There are better lefties out there. That is assuming there is such a thing as a "better leftie".