As much as I detest Sarah Palin (and everything she says and stands for) I don't think Jared Loughner's actions can be laid at her feet or blamed on her. An *awful* lot of people are trying to do that right now, and I just can't buy into it.
I think Palin's rhetoric is vile and despicable, but blaming her political ads and speech for Loughner's actions is like blaming rock and roll for "promiscuity" or pointing the finger at rap music as violence among black youth. It's just not that simple to connect the dots.
As someone said (George Carlin, maybe?) commenting on "violent TV shows" being responsible for real-world violence, "There's a lot of sitcoms on TV but you don't see people doing stand-up comedy in the streets."
I hope Jared Loughner rots in prison for the rest of his natural life, but try as I might I can't point the finger at Sarah Palin or Glen Beck or any the right-wingnuts for what he did. He did what he did because he's a nutcase, not because he was encouraged by some political ad...unless you want to credit political ads with a lot more power than any of us believe they have.