one that he/she shows to the "public" -- this is the one that Sarah Palin displayed at the Veep debates and to Katie Couric, apparently reasonable, just like every other citizen, respectful of democratic institutions -- like the media -- you know she reads every paper put on her desk -- and democratic processes...Then there is the face that s/he shows to the mob, signalling, with a wink that the law is meaningless and that she is willing to countenance violent solutions, racism, illegal suppression of dissenters, hate crimes, etc. This technique worked well in the 1930s...not only in Germany, but in Father Coughlin's radio addresses to the nation. Coughlin expressed a visceral hatred for Roosevelt on the airwaves and suggested that the New Deal was evil incarnate. The aggrieved, like himself, he suggested, would have to take violent action.
Palin and the mob she inflames have reactionary tradition to draw from. I've read on the comments here that Obama rallies might have equally inflammatory talk back. I don't  think so. Bloodthirsty threats against one's adversaries would not be tolerated and is not part of the admittedly and admirably liberal agenda. We allow our opponents their views and argue to show that they are wrong, not that they are evil in need of extirpation. Moderate Republicans should be shuddering. The extremists have taken over the podium there....