Attacking black conservatives is "encouraged" and "a mindset" on the left, Fox News contributor Juan Williams told host Sean Hannity Thursday night.

The most recent such attack came from a liberal blogger who described tea party favorite Herman Cain as a "black garbage pail kid" and a "monkey" propped up to reaffirm white "superiority."

On Thursday, the liberal Alternet blogger who hurled the racial insults at Cain defended the statements.

"Whenever Herman Cain and others have a moment where they can engage in “real talk” among their ideological compatriots or make a public, critical intervention against the obvious racial hostility which drives contemporary American conservatism, they either stand mute or enable it," he charged.

Earlier this week, the very same blogger also remarked that if Sarah Palin weren't white, she'd be "tarred and feathered as an 'affirmative action baby.'"