As for the Palin thing (directed to the thread generally): she deserves whatever PR catastrophe ensues. When you throw your hat in that ring, you can't pull it out after something like this.
That said, this shooting can't rationally be attributed to her. The guy was crazy, period. I don't care if he comes out and says, "Palin's website convinced me I needed to shoot Rep. Giffords." All that would indicate is the channel this guy's crazy went down.
Again, she can and should fry in the PR arena. That's not a rational game. After playing on irrationality for over two years now, she deserves every bit of irrationality heading back to her. But to blame her for this? Nah.