They did so recently on Hannity and Colmes. The two far-right commentators, perhaps the worst examples of Republican right wing trash imaginable, vehemently denied, on the basis of no evidence whatsoever, that genuine American hero Pat Tillman opposed the Iraq War and supported John Kerry. Hannity and Coulter (my God, just typing their names makes me almost nauseous) simply refused to believe that, once again, the two of them were simply flat on their ass wrong. They flatly contradicted the words of Tillman's own mother. Read the outrageous details and see if you don't agree.
I'll say it again: in any decent society two pathological liars like Hannity and Coulter wouldn't be anywhere near a microphone or television camera.
By the way, for a nice sampling of Coulter's ugly, psychotic, anti-American hatred, check here.