What does a liberal cable television host do when a guest confronts her with an ugly truth? Why, she cuts off his microphone, of course!

That's what happened on Thursday, when Nancy Grace -- host of a weeknight program on HLN, which was formerly known as the Headline Network -- clashed with Frank Taaffe, a friend of George Zimmerman who stated that black teenager Trayvon Martin had drugs in his system during their encounter on Feb. 26, 2012, in Sanford, Fla.